[root@ftp:/root] > fdisk -l Disk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x000c50af Device Boot Start End Blocks Id System /dev/sda1 * 2048 2099199 1048576 83 Linux /dev/sda2 2099200 104857599 51379200 8e Linux LVM Disk /dev/sdb: 10.7 GB, 10737418240 bytes, 20971520 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x714b81a4 Device Boot Start End Blocks Id System /dev/sdb1 2048 20971519 10484736 5 Extended /dev/sdb5 4096 3909631 1952768 83 Linux Disk /dev/sdc: 10.7 GB, 10737418240 bytes, 20971520 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/rootvg-root: 61.2 GB, 61194895360 bytes, 119521280 sector Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/rootvg-swap: 2147 MB, 2147483648 bytes, 4194304 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes [root@ftp:/root] > pvscan File descriptor 3 (pipe:[4198548]) leaked on pvscan invocation. Parent PID PV /dev/sda2 VG rootvg lvm2 [<49.00 GiB / 0 free] PV /dev/sdc VG rootvg lvm2 [<10.00 GiB / 0 free] Total: 2 [58.99 GiB] / in use: 2 [58.99 GiB] / in no VG: 0 [0 ] [root@ftp:/root] > pvdisplay File descriptor 3 (pipe:[4198548]) leaked on pvdisplay invocation. Parent --- Physical volume --- PV Name /dev/sda2 VG Name rootvg PV Size <49.00 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 12543 Free PE 0 Allocated PE 12543 PV UUID dXiNdh-ePAR-VhiU-PPOy-seF2-eezg-AYAwx5 --- Physical volume --- PV Name /dev/sdc VG Name rootvg PV Size 10.00 GiB / not usable 4.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 2559 Free PE 0 Allocated PE 2559 PV UUID YkDJG5-2JJp-DX2c-mGpS-QMn7-796E-VrA1i6 [root@ftp:/root] > pvdisplay /dev/sda2 File descriptor 3 (pipe:[4198548]) leaked on pvdisplay invocation. Parent --- Physical volume --- PV Name /dev/sda2 VG Name rootvg PV Size <49.00 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 12543 Free PE 0 Allocated PE 12543 PV UUID dXiNdh-ePAR-VhiU-PPOy-seF2-eezg-AYAwx5 [root@ftp:/root] > vgscan File descriptor 3 (pipe:[4198548]) leaked on vgscan invocation. Parent PID Reading volume groups from cache. Found volume group "rootvg" using metadata type lvm2 [root@ftp:/root] > vgs File descriptor 3 (pipe:[4198548]) leaked on vgs invocation. Parent PID 11 VG #PV #LV #SN Attr VSize VFree rootvg 2 2 0 wz--n- 58.99g 0 [root@ftp:/root] > vgdisplay File descriptor 3 (pipe:[4198548]) leaked on vgdisplay invocation. Parent --- Volume group --- VG Name rootvg System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 6 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 2 Act PV 2 VG Size 58.99 GiB PE Size 4.00 MiB Total PE 15102 Alloc PE / Size 15102 / 58.99 GiB Free PE / Size 0 / 0 VG UUID jYMaK1-7oqd-rFon-EI6M-daY2-oLIX-KVuXIO [root@ftp:/root] > vgdisplay rootvg File descriptor 3 (pipe:[4198548]) leaked on vgdisplay invocation. Parent --- Volume group --- VG Name rootvg System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 6 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 2 Act PV 2 VG Size 58.99 GiB PE Size 4.00 MiB Total PE 15102 Alloc PE / Size 15102 / 58.99 GiB Free PE / Size 0 / 0 VG UUID jYMaK1-7oqd-rFon-EI6M-daY2-oLIX-KVuXIO [root@ftp:/root] > lvscan File descriptor 3 (pipe:[4198548]) leaked on lvscan invocation. Parent PID ACTIVE '/dev/rootvg/swap' [2.00 GiB] inherit ACTIVE '/dev/rootvg/root' [56.99 GiB] inherit [root@ftp:/root] > lvs File descriptor 3 (pipe:[4198548]) leaked on lvs invocation. Parent PID 11 LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Syn root rootvg -wi-ao---- 56.99g swap rootvg -wi-ao---- 2.00g [root@ftp:/root] > lvdisplay File descriptor 3 (pipe:[4198548]) leaked on lvdisplay invocation. Parent --- Logical volume --- LV Path /dev/rootvg/swap LV Name swap VG Name rootvg LV UUID WySyzT-x2br-xtfU-Grbg-GjAj-KorV-m8yZvo LV Write Access read/write LV Creation host, time MiWiFi-R3L-srv, 2018-02-28 09:37:10 +0800 LV Status available # open 2 LV Size 2.00 GiB Current LE 512 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:1 --- Logical volume --- LV Path /dev/rootvg/root LV Name root VG Name rootvg LV UUID t71Wnu-l8eu-LZbw-GKew-jKTS-GxdF-d7XL5F LV Write Access read/write LV Creation host, time MiWiFi-R3L-srv, 2018-02-28 09:37:11 +0800 LV Status available # open 1 LV Size 56.99 GiB Current LE 14590 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0 [root@ftp:/root] > lvdisplay /dev/rootvg/root File descriptor 3 (pipe:[4198548]) leaked on lvdisplay invocation. Parent --- Logical volume --- LV Path /dev/rootvg/root LV Name root VG Name rootvg LV UUID t71Wnu-l8eu-LZbw-GKew-jKTS-GxdF-d7XL5F LV Write Access read/write LV Creation host, time MiWiFi-R3L-srv, 2018-02-28 09:37:11 +0800 LV Status available # open 1 LV Size 56.99 GiB Current LE 14590 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0 [root@ftp:/root] > df -TH Filesystem Type Size Used Avail Use% M /dev/mapper/centos_miwifi--r3l--srv-root xfs 51G 4.4G 47G 9% / devtmpfs devtmpfs 4.1G 0 4.1G 0% / tmpfs tmpfs 4.1G 29k 4.1G 1% / tmpfs tmpfs 4.1G 26M 4.1G 1% / tmpfs tmpfs 4.1G 0 4.1G 0% / /dev/sda1 xfs 1.1G 150M 914M 15% / //192.168.31.20/share cifs 7.8T 4.1T 3.8T 53% / tmpfs tmpfs 819M 0 819M 0% / [root@ftp:/root] > man lvcreate LVCREATE(8) System Manager's Manual LVCREATE(8) NAME lvcreate - Create a logical volume SYNOPSIS lvcreate option_args position_args [ option_args ] [ position_args ] -a|--activate y|n|ay --addtag Tag --alloc contiguous|cling|cling_by_tags|normal|any‐ where|inherit -A|--autobackup y|n -H|--cache --cachemetadataformat auto|1|2 --cachemode writethrough|writeback|passthrough --cachepolicy String --cachepool LV --cachesettings String -c|--chunksize Size[k|UNIT] --commandprofile String --config String -C|--contiguous y|n -d|--debug --discards passdown|nopassdown|ignore --driverloaded y|n --errorwhenfull y|n -l|--extents Number[PERCENT] -h|--help -K|--ignoreactivationskip --ignoremonitoring --longhelp -j|--major Number --[raid]maxrecoveryrate Size[k|UNIT] --metadataprofile String --minor Number --[raid]minrecoveryrate Size[k|UNIT] --mirrorlog core|disk -m|--mirrors Number --monitor y|n -n|--name String --nosync --noudevsync -p|--permission rw|r -M|--persistent y|n --poolmetadatasize Size[m|UNIT] --poolmetadataspare y|n --profile String -q|--quiet -r|--readahead auto|none|Number -R|--regionsize Size[m|UNIT] --reportformat basic|json -k|--setactivationskip y|n -L|--size Size[m|UNIT] -s|--snapshot -i|--stripes Number -I|--stripesize Size[k|UNIT] -t|--test -T|--thin --thinpool LV --type linear|striped|snapshot|mir‐ ror|raid|thin|cache|thin-pool|cache-pool -v|--verbose --version -V|--virtualsize Size[m|UNIT] -W|--wipesignatures y|n -y|--yes -Z|--zero y|n DESCRIPTION lvcreate creates a new LV in a VG. For standard LVs, this requires allocating logical extents from the VG's free physical extents. If there is not enough free space, the VG can be extended with other PVs (vgextend(8)), or existing LVs can be reduced or removed (lvremove(8), lvreduce(8).) To control which PVs a new LV will use, specify one or more PVs as position args at the end of the command line. lvcreate will allocate physical extents only from the specified PVs. lvcreate can also create snapshots of existing LVs, e.g. for backup purposes. The data in a new snapshot LV represents the content of the original LV from the time the snapshot was cre‐ ated. RAID LVs can be created by specifying an LV type when creating the LV (see lvmraid(7)). Different RAID levels require different numbers of unique PVs be available in the VG for allocation. Thin pools (for thin provisioning) and cache pools (for caching) are represented by special LVs with types thin-pool and cache-pool (see lvmthin(7) and lvmcache(7)). The pool LVs are not usable as standard block devices, but the LV names act as references to the pools. Thin LVs are thinly provisioned from a thin pool, and are cre‐ ated with a virtual size rather than a physical size. A cache LV is the combination of a standard LV with a cache pool, used to cache active portions of the LV to improve performance. Usage notes In the usage section below, --size Size can be replaced with --extents Number. See descriptions in the options section. In the usage section below, --name is omitted from the required options, even though it is typically used. When the name is not specified, a new LV name is generated with the "lvol" prefix and a unique numeric suffix. USAGE Create a linear LV. lvcreate -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ --type linear ] [ COMMON_OPTIONS ] [ PV ... ] - Create a striped LV (infers --type striped). lvcreate -i|--stripes Number -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -I|--stripesize Size[k|UNIT] ] [ COMMON_OPTIONS ] [ PV ... ] - Create a raid1 or mirror LV (infers --type raid1|mirror). lvcreate -m|--mirrors Number -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -R|--regionsize Size[m|UNIT] ] [ --mirrorlog core|disk ] [ --[raid]minrecoveryrate Size[k|UNIT] ] [ --[raid]maxrecoveryrate Size[k|UNIT] ] [ COMMON_OPTIONS ] [ PV ... ] - Create a raid LV (a specific raid level must be used, e.g. raid1). lvcreate --type raid -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -m|--mirrors Number ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ -R|--regionsize Size[m|UNIT] ] [ --[raid]minrecoveryrate Size[k|UNIT] ] [ --[raid]maxrecoveryrate Size[k|UNIT] ] [ COMMON_OPTIONS ] [ PV ... ] - Create a raid10 LV. lvcreate -m|--mirrors Number -i|--stripes Number -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -I|--stripesize Size[k|UNIT] ] [ -R|--regionsize Size[m|UNIT] ] [ --[raid]minrecoveryrate Size[k|UNIT] ] [ --[raid]maxrecoveryrate Size[k|UNIT] ] [ COMMON_OPTIONS ] [ PV ... ] - Create a COW snapshot LV of an origin LV. lvcreate -s|--snapshot -L|--size Size[m|UNIT] LV [ -l|--extents Number[PERCENT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ -c|--chunksize Size[k|UNIT] ] [ --type snapshot ] [ COMMON_OPTIONS ] [ PV ... ] - Create a thin pool. lvcreate --type thin-pool -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --thinpool LV_new ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] [ PV ... ] - Create a cache pool. lvcreate --type cache-pool -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -H|--cache ] [ -c|--chunksize Size[k|UNIT] ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --cachemode writethrough|writeback|passthrough ] [ --cachepolicy String ] [ --cachesettings String ] [ --cachemetadataformat auto|1|2 ] [ COMMON_OPTIONS ] [ PV ... ] - Create a thin LV in a thin pool (infers --type thin). lvcreate -V|--virtualsize Size[m|UNIT] --thinpool LV_thinpool VG [ -T|--thin ] [ --type thin ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] - Create a thin LV that is a snapshot of an existing thin LV (infers --type thin). lvcreate -s|--snapshot LV_thin [ --type thin ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] - Create a thin LV that is a snapshot of an external origin LV. lvcreate --type thin --thinpool LV_thinpool LV [ -T|--thin ] [ -c|--chunksize Size[k|UNIT] ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] - Create a thin LV, first creating a thin pool for it, where the new thin pool is named by the --thinpool arg. lvcreate --type thin -V|--virtualsize Size[m|UNIT] -L|--size Size[m|UNIT] --thinpool LV_new [ -l|--extents Number[PERCENT] ] [ -T|--thin ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] [ PV ... ] - Create a cache LV, first creating a new origin LV, then combining it with the existing cache pool named by the --cachepool arg. lvcreate --type cache -L|--size Size[m|UNIT] --cachepool LV_cachepool VG [ -l|--extents Number[PERCENT] ] [ -H|--cache ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --cachemode writethrough|writeback|passthrough ] [ --cachepolicy String ] [ --cachesettings String ] [ --cachemetadataformat auto|1|2 ] [ COMMON_OPTIONS ] [ PV ... ] - Common options for command: [ -a|--activate y|n|ay ] [ -A|--autobackup y|n ] [ -C|--contiguous y|n ] [ -K|--ignoreactivationskip ] [ -j|--major Number ] [ -n|--name String ] [ -p|--permission rw|r ] [ -M|--persistent y|n ] [ -r|--readahead auto|none|Number ] [ -k|--setactivationskip y|n ] [ -W|--wipesignatures y|n ] [ -Z|--zero y|n ] [ --addtag Tag ] [ --alloc contiguous|cling|cling_by_tags|normal|any‐ where|inherit ] [ --ignoremonitoring ] [ --metadataprofile String ] [ --minor Number ] [ --monitor y|n ] [ --nosync ] [ --noudevsync ] [ --reportformat basic|json ] Common options for lvm: [ -d|--debug ] [ -h|--help ] [ -q|--quiet ] [ -t|--test ] [ -v|--verbose ] [ -y|--yes ] [ --commandprofile String ] [ --config String ] [ --driverloaded y|n ] [ --longhelp ] [ --profile String ] [ --version ] OPTIONS -a|--activate y|n|ay Controls the active state of the new LV. y makes the LV active, or available. New LVs are made active by default. n makes the LV inactive, or unavailable, only when possible. In some cases, creating an LV requires it to be active. For example, COW snapshots of an active origin LV can only be created in the active state (this does not apply to thin snapshots). The --zero option normally requires the LV to be active. If autoactivation ay is used, the LV is only activated if it matches an item in lvm.conf activation/auto_activation_volume_list. ay implies --zero n and --wipesignatures n. See lvm‐ lockd(8) for more information about activation options for shared VGs. See clvmd(8) for more information about activation options for clustered VGs. --addtag Tag Adds a tag to a PV, VG or LV. This option can be repeated to add multiple tags at once. See lvm(8) for information about tags. --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit Determines the allocation policy when a command needs to allocate Physical Extents (PEs) from the VG. Each VG and LV has an allocation policy which can be changed with vgchange/lvchange, or overriden on the command line. normal applies common sense rules such as not placing parallel stripes on the same PV. inherit applies the VG policy to an LV. contiguous requires new PEs be placed adjacent to existing PEs. cling places new PEs on the same PV as existing PEs in the same stripe of the LV. If there are sufficient PEs for an allocation, but normal does not use them, anywhere will use them even if it reduces performance, e.g. by placing two stripes on the same PV. Optional positional PV args on the command line can also be used to limit which PVs the command will use for allocation. See lvm(8) for more information about allocation. -A|--autobackup y|n Specifies if metadata should be backed up automatically after a change. Enabling this is strongly advised! See vgcfgbackup(8) for more information. -H|--cache Specifies the command is handling a cache LV or cache pool. See --type cache and --type cache-pool. See lvm‐ cache(7) for more information about LVM caching. --cachemetadataformat auto|1|2 Specifies the cache metadata format used by cache target. --cachemode writethrough|writeback|passthrough Specifies when writes to a cache LV should be considered complete. writeback considers a write complete as soon as it is stored in the cache pool. writethough considers a write complete only when it has been stored in both the cache pool and on the origin LV. While writethrough may be slower for writes, it is more resilient if something should happen to a device associated with the cache pool LV. With passthrough, all reads are served from the ori‐ gin LV (all reads miss the cache) and all writes are for‐ warded to the origin LV; additionally, write hits cause cache block invalidates. See lvmcache(7) for more infor‐ mation. --cachepolicy String Specifies the cache policy for a cache LV. See lvm‐ cache(7) for more information. --cachepool LV The name of a cache pool LV. --cachesettings String Specifies tunable values for a cache LV in "Key = Value" form. Repeat this option to specify multiple values. (The default values should usually be adequate.) The special string value default switches settings back to their default kernel values and removes them from the list of settings stored in LVM metadata. See lvmcache(7) for more information. -c|--chunksize Size[k|UNIT] The size of chunks in a snapshot, cache pool or thin pool. For snapshots, the value must be a power of 2 between 4KiB and 512KiB and the default value is 4. For a cache pool the value must be between 32KiB and 1GiB and the default value is 64. For a thin pool the value must be between 64KiB and 1GiB and the default value starts with 64 and scales up to fit the pool metadata size within 128MiB, if the pool metadata size is not speci‐ fied. The value must be a multiple of 64KiB. See lvmthin(7) and lvmcache(7) for more information. --commandprofile String The command profile to use for command configuration. See lvm.conf(5) for more information about profiles. --config String Config settings for the command. These override lvm.conf settings. The String arg uses the same format as lvm.conf, or may use section/field syntax. See lvm.conf(5) for more information about config. -C|--contiguous y|n Sets or resets the contiguous allocation policy for LVs. Default is no contiguous allocation based on a next free principle. It is only possible to change a non-contigu‐ ous allocation policy to contiguous if all of the allo‐ cated physical extents in the LV are already contiguous. -d|--debug ... Set debug level. Repeat from 1 to 6 times to increase the detail of messages sent to the log file and/or syslog (if configured). --discards passdown|nopassdown|ignore Specifies how the device-mapper thin pool layer in the kernel should handle discards. ignore causes the thin pool to ignore discards. nopassdown causes the thin pool to process discards itself to allow reuse of unneeded extents in the thin pool. passdown causes the thin pool to process discards itself (like nopassdown) and pass the discards to the underlying device. See lvmthin(7) for more information. --driverloaded y|n If set to no, the command will not attempt to use device- mapper. For testing and debugging. --errorwhenfull y|n Specifies thin pool behavior when data space is exhausted. When yes, device-mapper will immediately return an error when a thin pool is full and an I/O request requires space. When no, device-mapper will queue these I/O requests for a period of time to allow the thin pool to be extended. Errors are returned if no space is available after the timeout. (Also see dm- thin-pool kernel module option no_space_timeout.) See lvmthin(7) for more information. -l|--extents Number[PERCENT] Specifies the size of the new LV in logical extents. The --size and --extents options are alternate methods of specifying size. The total number of physical extents used will be greater when redundant data is needed for RAID levels. An alternate syntax allows the size to be determined indirectly as a percentage of the size of a related VG, LV, or set of PVs. The suffix %VG denotes the total size of the VG, the suffix %FREE the remaining free space in the VG, and the suffix %PVS the free space in the specified PVs. For a snapshot, the size can be expressed as a percentage of the total size of the origin LV with the suffix %ORIGIN (100%ORIGIN provides space for the whole origin). When expressed as a percentage, the size defines an upper limit for the number of logical extents in the new LV. The precise number of logical extents in the new LV is not determined until the command has completed. -h|--help Display help text. -K|--ignoreactivationskip Ignore the "activation skip" LV flag during activation to allow LVs with the flag set to be activated. --ignoremonitoring Do not interact with dmeventd unless --monitor is speci‐ fied. Do not use this if dmeventd is already monitoring a device. --longhelp Display long help text. -j|--major Number Sets the major number of an LV block device. --[raid]maxrecoveryrate Size[k|UNIT] Sets the maximum recovery rate for a RAID LV. The rate value is an amount of data per second for each device in the array. Setting the rate to 0 means it will be unbounded. See lvmraid(7) for more information. --metadataprofile String The metadata profile to use for command configuration. See lvm.conf(5) for more information about profiles. --minor Number Sets the minor number of an LV block device. --[raid]minrecoveryrate Size[k|UNIT] Sets the minimum recovery rate for a RAID LV. The rate value is an amount of data per second for each device in the array. Setting the rate to 0 means it will be unbounded. See lvmraid(7) for more information. --mirrorlog core|disk Specifies the type of mirror log for LVs with the "mir‐ ror" type (does not apply to the "raid1" type.) disk is a persistent log and requires a small amount of storage space, usually on a separate device from the data being mirrored. core is not persistent; the log is kept only in memory. In this case, the mirror must be synchronized (by copying LV data from the first device to others) each time the LV is activated, e.g. after reboot. mirrored is a persistent log that is itself mirrored, but should be avoided. Instead, use the raid1 type for log redundancy. -m|--mirrors Number Specifies the number of mirror images in addition to the original LV image, e.g. --mirrors 1 means there are two images of the data, the original and one mirror image. Optional positional PV args on the command line can spec‐ ify the devices the images should be placed on. There are two mirroring implementations: "raid1" and "mirror". These are the names of the corresponding LV types, or "segment types". Use the --type option to specify which to use (raid1 is default, and mirror is legacy) Use lvm.conf global/mirror_segtype_default and global/raid10_segtype_default to configure the default types. See the --nosync option for avoiding initial image synchronization. See lvmraid(7) for more informa‐ tion. --monitor y|n Start (yes) or stop (no) monitoring an LV with dmeventd. dmeventd monitors kernel events for an LV, and performs automated maintenance for the LV in reponse to specific events. See dmeventd(8) for more information. -n|--name String Specifies the name of a new LV. When unspecified, a default name of "lvol#" is generated, where # is a number generated by LVM. --nosync Causes the creation of mirror, raid1, raid4, raid5 and raid10 to skip the initial synchronization. In case of mirror, raid1 and raid10, any data written afterwards will be mirrored, but the original contents will not be copied. In case of raid4 and raid5, no parity blocks will be written, though any data written afterwards will cause parity blocks to be stored. This is useful for skipping a potentially long and resource intensive initial sync of an empty mirror/raid1/raid4/raid5 and raid10 LV. This option is not valid for raid6, because raid6 relies on proper parity (P and Q Syndromes) being created during initial synchronization in order to reconstruct proper user date in case of device failures. raid0 and raid0_meta do not provide any data copies or parity sup‐ port and thus do not support initial synchronization. --noudevsync Disables udev synchronisation. The process will not wait for notification from udev. It will continue irrespective of any possible udev processing in the background. Only use this if udev is not running or has rules that ignore the devices LVM creates. -p|--permission rw|r Set access permission to read only r or read and write rw. -M|--persistent y|n When yes, makes the specified minor number persistent. --poolmetadatasize Size[m|UNIT] Specifies the size of the new pool metadata LV. --poolmetadataspare y|n Enable or disable the automatic creation and management of a spare pool metadata LV in the VG. A spare metadata LV is reserved space that can be used when repairing a pool. --profile String An alias for --commandprofile or --metadataprofile, depending on the command. -q|--quiet ... Suppress output and log messages. Overrides --debug and --verbose. Repeat once to also suppress any prompts with answer 'no'. -r|--readahead auto|none|Number Sets read ahead sector count of an LV. auto is the default which allows the kernel to choose a suitable value automatically. none is equivalent to zero. -R|--regionsize Size[m|UNIT] Size of each raid or mirror synchronization region. lvm.conf activation/raid_region_size can be used to con‐ figure a default. --reportformat basic|json Overrides current output format for reports which is defined globally by the report/output_format setting in lvm.conf. basic is the original format with columns and rows. If there is more than one report per command, each report is prefixed with the report name for identifica‐ tion. json produces report output in JSON format. See lvmreport(7) for more information. -k|--setactivationskip y|n Persistently sets (yes) or clears (no) the "activation skip" flag on an LV. An LV with this flag set is not activated unless the --ignoreactivationskip option is used by the activation command. This flag is set by default on new thin snapshot LVs. The flag is not applied to deactivation. The current value of the flag is indicated in the lvs lv_attr bits. -L|--size Size[m|UNIT] Specifies the size of the new LV. The --size and --extents options are alternate methods of specifying size. The total number of physical extents used will be greater when redundant data is needed for RAID levels. -s|--snapshot Create a snapshot. Snapshots provide a "frozen image" of an origin LV. The snapshot LV can be used, e.g. for backups, while the origin LV continues to be used. This option can create a COW (copy on write) snapshot, or a thin snapshot (in a thin pool.) Thin snapshots are cre‐ ated when the origin is a thin LV and the size option is NOT specified. Thin snapshots share the same blocks in the thin pool, and do not allocate new space from the VG. Thin snapshots are created with the "activation skip" flag, see --setactivationskip. A thin snapshot of a non- thin "external origin" LV is created when a thin pool is specified. Unprovisioned blocks in the thin snapshot LV are read from the external origin LV. The external origin LV must be read-only. See lvmthin(7) for more informa‐ tion about LVM thin provisioning. COW snapshots are cre‐ ated when a size is specified. The size is allocated from space in the VG, and is the amount of space that can be used for saving COW blocks as writes occur to the origin or snapshot. The size chosen should depend upon the amount of writes that are expected; often 20% of the ori‐ gin LV is enough. If COW space runs low, it can be extended with lvextend (shrinking is also allowed with lvreduce.) A small amount of the COW snapshot LV size is used to track COW block locations, so the full size is not available for COW data blocks. Use lvs to check how much space is used, and see --monitor to to automatically extend the size to avoid running out of space. -i|--stripes Number Specifies the number of stripes in a striped LV. This is the number of PVs (devices) that a striped LV is spread across. Data that appears sequential in the LV is spread across multiple devices in units of the stripe size (see --stripesize). This does not change existing allocated space, but only applies to space being allocated by the command. When creating a RAID 4/5/6 LV, this number does not include the extra devices that are required for par‐ ity. The largest number depends on the RAID type (raid0: 64, raid10: 32, raid4/5: 63, raid6: 62), and when unspec‐ ified, the default depends on the RAID type (raid0: 2, raid10: 2, raid4/5: 3, raid6: 5.) To stripe a new raid LV across all PVs by default, see lvm.conf alloca‐ tion/raid_stripe_all_devices. -I|--stripesize Size[k|UNIT] The amount of data that is written to one device before moving to the next in a striped LV. -t|--test Run in test mode. Commands will not update metadata. This is implemented by disabling all metadata writing but nevertheless returning success to the calling function. This may lead to unusual error messages in multi-stage operations if a tool relies on reading back metadata it believes has changed but hasn't. -T|--thin Specifies the command is handling a thin LV or thin pool. See --type thin, --type thin-pool, and --virtualsize. See lvmthin(7) for more information about LVM thin provi‐ sioning. --thinpool LV The name of a thin pool LV. --type linear|striped|snapshot|mir‐ ror|raid|thin|cache|thin-pool|cache-pool The LV type, also known as "segment type" or "segtype". See usage descriptions for the specific ways to use these types. For more information about redundancy and perfor‐ mance (raid<N>, mirror, striped, linear) see lvmraid(7). For thin provisioning (thin, thin-pool) see lvmthin(7). For performance caching (cache, cache-pool) see lvm‐ cache(7). For copy-on-write snapshots (snapshot) see usage definitions. Several commands omit an explicit type option because the type is inferred from other options or shortcuts (e.g. --stripes, --mirrors, --snap‐ shot, --virtualsize, --thin, --cache). Use inferred types with care because it can lead to unexpected results. -v|--verbose ... Set verbose level. Repeat from 1 to 4 times to increase the detail of messages sent to stdout and stderr. --version Display version information. -V|--virtualsize Size[m|UNIT] The virtual size of a new thin LV. See lvmthin(7) for more information about LVM thin provisioning. Using vir‐ tual size (-V) and actual size (-L) together creates a sparse LV. lvm.conf global/sparse_segtype_default deter‐ mines the default segment type used to create a sparse LV. Anything written to a sparse LV will be returned when reading from it. Reading from other areas of the LV will return blocks of zeros. When using a snapshot to create a sparse LV, a hidden virtual device is created using the zero target, and the LV has the suffix _vorigin. Snapshots are less efficient than thin provi‐ sioning when creating large sparse LVs (GiB). -W|--wipesignatures y|n Controls detection and subsequent wiping of signatures on new LVs. There is a prompt for each signature detected to confirm its wiping (unless --yes is used to override confirmations.) When not specified, signatures are wiped whenever zeroing is done (see --zero). This behaviour can be configured with lvm.conf allocation/wipe_signa‐ tures_when_zeroing_new_lvs. If blkid wiping is used (lvm.conf allocation/use_blkid_wiping) and LVM is com‐ piled with blkid wiping support, then the blkid(8) library is used to detect the signatures (use blkid -k to list the signatures that are recognized). Otherwise, native LVM code is used to detect signatures (only MD RAID, swap and LUKS signatures are detected in this case.) The LV is not wiped if the read only flag is set. -y|--yes Do not prompt for confirmation interactively but always assume the answer yes. Use with extreme caution. (For automatic no, see -qq.) -Z|--zero y|n Controls zeroing of the first 4KiB of data in the new LV. Default is y. Snapshot COW volumes are always zeroed. LV is not zeroed if the read only flag is set. Warning: trying to mount an unzeroed LV can cause the system to hang. VARIABLES VG Volume Group name. See lvm(8) for valid names. For lvcreate, the required VG positional arg may be omitted when the VG name is included in another option, e.g. --name VG/LV. LV Logical Volume name. See lvm(8) for valid names. An LV positional arg generally includes the VG name and LV name, e.g. VG/LV. LV followed by _<type> indicates that an LV of the given type is required. (raid represents raid<N> type) PV Physical Volume name, a device path under /dev. For com‐ mands managing physical extents, a PV positional arg gen‐ erally accepts a suffix indicating a range (or multiple ranges) of physical extents (PEs). When the first PE is omitted, it defaults to the start of the device, and when the last PE is omitted it defaults to end. Start and end range (inclusive): PV[:PE-PE]... Start and length range (counting from 0): PV[:PE+PE]... String See the option description for information about the string content. Size[UNIT] Size is an input number that accepts an optional unit. Input units are always treated as base two values, regardless of capitalization, e.g. 'k' and 'K' both refer to 1024. The default input unit is specified by letter, followed by |UNIT. UNIT represents other possible input units: bBsSkKmMgGtTpPeE. b|B is bytes, s|S is sectors of 512 bytes, k|K is kilobytes, m|M is megabytes, g|G is gigabytes, t|T is terabytes, p|P is petabytes, e|E is exabytes. (This should not be confused with the output control --units, where capital letters mean multiple of 1000.) ENVIRONMENT VARIABLES See lvm(8) for information about environment variables used by lvm. For example, LVM_VG_NAME can generally be substituted for a required VG parameter. ADVANCED USAGE Alternate command forms, advanced command usage, and listing of all valid syntax for completeness. Create an LV that returns errors when used. lvcreate --type error -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ COMMON_OPTIONS ] - Create an LV that returns zeros when read. lvcreate --type zero -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ COMMON_OPTIONS ] - Create a linear LV. lvcreate --type linear -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ COMMON_OPTIONS ] [ PV ... ] - Create a striped LV (also see lvcreate --stripes). lvcreate --type striped -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ COMMON_OPTIONS ] [ PV ... ] - Create a mirror LV (also see --type raid1). lvcreate --type mirror -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -m|--mirrors Number ] [ -R|--regionsize Size[m|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --mirrorlog core|disk ] [ COMMON_OPTIONS ] [ PV ... ] - Create a COW snapshot LV of an origin LV (also see --snapshot). lvcreate --type snapshot -L|--size Size[m|UNIT] LV [ -l|--extents Number[PERCENT] ] [ -s|--snapshot ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ -c|--chunksize Size[k|UNIT] ] [ COMMON_OPTIONS ] [ PV ... ] - Create a sparse COW snapshot LV of a virtual origin LV (also see --snapshot). lvcreate --type snapshot -L|--size Size[m|UNIT] -V|--virtualsize Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -s|--snapshot ] [ -c|--chunksize Size[k|UNIT] ] [ COMMON_OPTIONS ] [ PV ... ] - Create a sparse COW snapshot LV of a virtual origin LV. lvcreate -s|--snapshot -L|--size Size[m|UNIT] -V|--virtualsize Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -c|--chunksize Size[k|UNIT] ] [ --type snapshot ] [ COMMON_OPTIONS ] [ PV ... ] - Create a thin pool (infers --type thin-pool). lvcreate -T|--thin -L|--size Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --type thin-pool ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] [ PV ... ] - Create a thin pool named by the --thinpool arg (infers --type thin-pool). lvcreate -L|--size Size[m|UNIT] --thinpool LV_new VG [ -l|--extents Number[PERCENT] ] [ -T|--thin ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --type thin-pool ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] [ PV ... ] - Create a cache pool named by the --cachepool arg (variant, uses --cachepool in place of --name). lvcreate --type cache-pool -L|--size Size[m|UNIT] --cachepool LV_new VG [ -l|--extents Number[PERCENT] ] [ -H|--cache ] [ -c|--chunksize Size[k|UNIT] ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --cachemode writethrough|writeback|passthrough ] [ --cachepolicy String ] [ --cachesettings String ] [ --cachemetadataformat auto|1|2 ] [ COMMON_OPTIONS ] [ PV ... ] - Create a thin LV in a thin pool. lvcreate --type thin -V|--virtualsize Size[m|UNIT] --thinpool LV_thinpool VG [ -T|--thin ] [ -c|--chunksize Size[k|UNIT] ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] - Create a thin LV in a thin pool named in the first arg (variant, also see --thinpool for naming pool). lvcreate --type thin -V|--virtualsize Size[m|UNIT] LV_thinpool [ -T|--thin ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] - Create a thin LV in the thin pool named in the first arg (variant, infers --type thin, also see --thinpool for naming pool.) lvcreate -V|--virtualsize Size[m|UNIT] LV_thinpool [ -T|--thin ] [ --type thin ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] - Create a thin LV that is a snapshot of an existing thin LV. lvcreate --type thin LV_thin [ -T|--thin ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] - Create a thin LV that is a snapshot of an existing thin LV (infers --type thin). lvcreate -T|--thin LV_thin [ --type thin ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] - Create a thin LV that is a snapshot of an external origin LV (infers --type thin). lvcreate -s|--snapshot --thinpool LV_thinpool LV [ --type thin ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] - Create a thin LV, first creating a thin pool for it, where the new thin pool is named by the --thinpool arg (variant, infers --type thin). lvcreate -V|--virtualsize Size[m|UNIT] -L|--size Size[m|UNIT] --thinpool LV_new [ -l|--extents Number[PERCENT] ] [ -T|--thin ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] [ PV ... ] - Create a thin LV, first creating a thin pool for it, where the new thin pool is named by the --thinpool arg (variant, infers --type thin). lvcreate -V|--virtualsize Size[m|UNIT] -L|--size Size[m|UNIT] --thinpool LV_new VG [ -l|--extents Number[PERCENT] ] [ -T|--thin ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] [ PV ... ] - Create a thin LV, first creating a thin pool for it, where the new thin pool is named in the first arg, or the new thin pool name is generated when the first arg is a VG name. lvcreate --type thin -V|--virtualsize Size[m|UNIT] -L|--size Size[m|UNIT] VG|LV_new [ -l|--extents Number[PERCENT] ] [ -T|--thin ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] [ PV ... ] - Create a thin LV, first creating a thin pool for it, where the new thin pool is named in the first arg, or the new thin pool name is generated when the first arg is a VG name (variant, infers --type thin). lvcreate -T|--thin -V|--virtualsize Size[m|UNIT] -L|--size Size[m|UNIT] VG|LV_new [ -l|--extents Number[PERCENT] ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] [ PV ... ] - Create a thin LV, first creating a thin pool for it (infers --type thin). Create a sparse snapshot of a virtual origin LV (infers --type snapshot). Chooses --type thin or --type snapshot according to config setting sparse_segtype_default. lvcreate -L|--size Size[m|UNIT] -V|--virtualsize Size[m|UNIT] VG [ -l|--extents Number[PERCENT] ] [ -s|--snapshot ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --type snapshot ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --discards passdown|nopassdown|ignore ] [ --errorwhenfull y|n ] [ COMMON_OPTIONS ] [ PV ... ] - Create a cache LV, first creating a new origin LV, then combining it with the existing cache pool named by the --cachepool arg (variant, infers --type cache). lvcreate -L|--size Size[m|UNIT] --cachepool LV_cachepool VG [ -l|--extents Number[PERCENT] ] [ -H|--cache ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --type cache ] [ --cachemode writethrough|writeback|passthrough ] [ --cachepolicy String ] [ --cachesettings String ] [ --cachemetadataformat auto|1|2 ] [ COMMON_OPTIONS ] [ PV ... ] - Create a cache LV, first creating a new origin LV, then combining it with the existing cache pool named in the first arg (variant, also use --cachepool). lvcreate --type cache -L|--size Size[m|UNIT] LV_cachepool [ -l|--extents Number[PERCENT] ] [ -H|--cache ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ --cachemode writethrough|writeback|passthrough ] [ --cachepolicy String ] [ --cachesettings String ] [ --cachemetadataformat auto|1|2 ] [ COMMON_OPTIONS ] [ PV ... ] - When LV is a cache pool, create a cache LV, first creating a new origin LV, then combining it with the existing cache pool named in the first arg (variant, infers --type cache, also use --cachepool). When LV is not a cache pool, convert the specified LV to type cache after creating a new cache pool LV to use (use lvconvert). lvcreate -H|--cache -L|--size Size[m|UNIT] LV [ -l|--extents Number[PERCENT] ] [ -c|--chunksize Size[k|UNIT] ] [ -i|--stripes Number ] [ -I|--stripesize Size[k|UNIT] ] [ --cachemode writethrough|writeback|passthrough ] [ --cachepolicy String ] [ --cachesettings String ] [ --cachemetadataformat auto|1|2 ] [ --poolmetadatasize Size[m|UNIT] ] [ --poolmetadataspare y|n ] [ COMMON_OPTIONS ] [ PV ... ] - EXAMPLES Create a striped LV with 3 stripes, a stripe size of 8KiB and a size of 100MiB. The LV name is chosen by lvcreate. lvcreate -i 3 -I 8 -L 100m vg00 Create a raid1 LV with two images, and a useable size of 500 MiB. This operation requires two devices, one for each mirror image. RAID metadata (superblock and bitmap) is also included on the two devices. lvcreate --type raid1 -m1 -L 500m -n mylv vg00 Create a mirror LV with two images, and a useable size of 500 MiB. This operation requires three devices: two for mirror images and one for a disk log. lvcreate --type mirror -m1 -L 500m -n mylv vg00 Create a mirror LV with 2 images, and a useable size of 500 MiB. This operation requires 2 devices because the log is in memory. lvcreate --type mirror -m1 --mirrorlog core -L 500m -n mylv vg00 Create a copy-on-write snapshot of an LV: lvcreate --snapshot --size 100m --name mysnap vg00/mylv Create a copy-on-write snapshot with a size sufficient for over‐ writing 20% of the size of the original LV. lvcreate -s -l 20%ORIGIN -n mysnap vg00/mylv Create a sparse LV with 1TiB of virtual space, and actual space just under 100MiB. lvcreate --snapshot --virtualsize 1t --size 100m --name mylv vg00 Create a linear LV with a usable size of 64MiB on specific phys‐ ical extents. lvcreate -L 64m -n mylv vg00 /dev/sda:0-7 /dev/sdb:0-7 Create a RAID5 LV with a usable size of 5GiB, 3 stripes, a stripe size of 64KiB, using a total of 4 devices (including one for parity). lvcreate --type raid5 -L 5G -i 3 -I 64 -n mylv vg00 Create a RAID5 LV using all of the free space in the VG and spanning all the PVs in the VG (note that the command will fail if there are more than 8 PVs in the VG, in which case -i 7 must be used to get to the current maximum of 8 devices including parity for RaidLVs). lvcreate --config allocation/raid_stripe_all_devices=1 --type raid5 -l 100%FREE -n mylv vg00 Create RAID10 LV with a usable size of 5GiB, using 2 stripes, each on a two-image mirror. (Note that the -i and -m arguments behave differently: -i specifies the total number of stripes, but -m specifies the number of images in addition to the first image). lvcreate --type raid10 -L 5G -i 2 -m 1 -n mylv vg00 Create a 1TiB thin LV, first creating a new thin pool for it, where the thin pool has 100MiB of space, uses 2 stripes, has a 64KiB stripe size, and 256KiB chunk size. lvcreate --type thin --name mylv --thinpool mypool -V 1t -L 100m -i 2 -I 64 -c 256 vg00 Create a thin snapshot of a thin LV (the size option must not be used, otherwise a copy-on-write snapshot would be created). lvcreate --snapshot --name mysnap vg00/thinvol Create a thin snapshot of the read-only inactive LV named "ori‐ gin" which becomes an external origin for the thin snapshot LV. lvcreate --snapshot --name mysnap --thinpool mypool vg00/origin Create a cache pool from a fast physical device. The cache pool can then be used to cache an LV. lvcreate --type cache-pool -L 1G -n my_cpool vg00 /dev/fast1 Create a cache LV, first creating a new origin LV on a slow physical device, then combining the new origin LV with an exist‐ ing cache pool. lvcreate --type cache --cachepool my_cpool -L 100G -n mylv vg00 /dev/slow1 SEE ALSO lvm(8) lvm.conf(5) lvmconfig(8) pvchange(8) pvck(8) pvcreate(8) pvdisplay(8) pvmove(8) pvre‐ move(8) pvresize(8) pvs(8) pvscan(8) vgcfgbackup(8) vgcfgrestore(8) vgchange(8) vgck(8) vgcreate(8) vgconvert(8) vgdisplay(8) vgexport(8) vgextend(8) vgimport(8) vgimportclone(8) vgmerge(8) vgmknodes(8) vgreduce(8) vgremove(8) vgrename(8) vgs(8) vgscan(8) vgsplit(8) lvcreate(8) lvchange(8) lvconvert(8) lvdisplay(8) lvextend(8) lvreduce(8) lvremove(8) lvrename(8) lvresize(8) lvs(8) lvscan(8) lvm-fullreport(8) lvm-lvpoll(8) lvm2-activation-generator(8) blkdeactivate(8) lvmdump(8) dmeventd(8) lvmetad(8) lvmpolld(8) lvmlockd(8) lvmlockctl(8) clvmd(8) cmirrord(8) lvmdbusd(8) lvmsystemid(7) lvmreport(7) lvmraid(7) lvmthin(7) lvmcache(7) Red Hat, Inc. LVM TOOLS 2.02.171(2)-RHEL7 (2017-05-03) LVCREATE(8) [root@ftp:/root] >