拉伸一个逻辑卷（逻辑卷的拉伸操作可以在线执行，不需要卸载逻辑卷）
[root@zq ~]# lvextend -L 1G /dev/zq/mylv #扩展1g的大小给mylv逻辑卷 这个没有+ 是不可以的 New size given (256 extents) not larger than existing size (512 extents) Run `lvextend --help' for more information. [root@zq ~]# lvextend -L +1G /dev/zq/mylv #这才是对的 Size of logical volume zq/mylv changed from 2.00 GiB (512 extents) to 3.00 GiB (768 extents). Logical volume mylv successfully resized. [root@zq ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert mylv zq -wi-ao---- 3.00g [root@zq ~]# df -h #这里发现大小并没有变，刚刚拉伸的是底层并没有更新文件系统，操作系统并不能识别文件系统，我们需要更新一下 文件系统 容量 已用 可用 已用% 挂载点 /dev/sda3 20G 3.2G 17G 16% / devtmpfs 475M 0 475M 0% /dev tmpfs 489M 156K 489M 1% /dev/shm tmpfs 489M 7.1M 482M 2% /run tmpfs 489M 0 489M 0% /sys/fs/cgroup /dev/mapper/zq-mylv 2.0G 6.0M 1.8G 1% /mnt /dev/sda1 497M 138M 359M 28% /boot tmpfs 98M 4.0K 98M 1% /run/user/42 tmpfs 98M 20K 98M 1% /run/user/1000 [root@zq ~]# resize2fs /dev/zq/mylv #更新文件系统，操作系统重新扫描，这个时候才可以使用额外的1g空间 resize2fs 1.42.9 (28-Dec-2013) Filesystem at /dev/zq/mylv is mounted on /mnt; on-line resizing required old_desc_blocks = 1, new_desc_blocks = 1 The filesystem on /dev/zq/mylv is now 786432 blocks long. [root@zq ~]# df -h 文件系统 容量 已用 可用 已用% 挂载点 /dev/sda3 20G 3.2G 17G 16% / devtmpfs 475M 0 475M 0% /dev tmpfs 489M 156K 489M 1% /dev/shm tmpfs 489M 7.1M 482M 2% /run tmpfs 489M 0 489M 0% /sys/fs/cgroup /dev/mapper/zq-mylv 2.9G 6.0M 2.8G 1% /mnt /dev/sda1 497M 138M 359M 28% /boot tmpfs 98M 4.0K 98M 1% /run/user/42 tmpfs 98M 20K 98M 1% /run/user/1000
[root@zq ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert mylv zq -wi-a----- 3.00g [root@zq ~]# vgs VG #PV #LV #SN Attr VSize VFree zq 2 1 0 wz--n- 19.99g 16.99g [root@zq ~]# lvextend -L +17G /dev/zq/mylv Insufficient free space: 4352 extents needed, but only 4350 available [root@zq ~]# lvextend -L +16G /dev/zq/mylv Size of logical volume zq/mylv changed from 3.00 GiB (768 extents) to 19.00 GiB (4864 extents). Logical volume mylv successfully resized. [root@zq ~]# resize2fs /dev/zq/mylv resize2fs 1.42.9 (28-Dec-2013) 请先运行 'e2fsck -f /dev/zq/mylv'. [root@zq ~]# e2fsck -f /dev/zq/mylv e2fsck 1.42.9 (28-Dec-2013) /dev/zq/mylv: 正在修复日志 第一步: 检查inode,块,和大小 第二步: 检查目录结构 第3步: 检查目录连接性 Pass 4: Checking reference counts 第5步: 检查簇概要信息 Free inodes count wrong (196597, counted=196596). 处理<y>? 是 /dev/zq/mylv: ***** 文件系统已修改 ***** /dev/zq/mylv: 12/196608 files (0.0% non-contiguous), 30268/786432 blocks [root@zq ~]# df -h 文件系统 容量 已用 可用 已用% 挂载点 /dev/sda3 20G 3.2G 17G 16% / devtmpfs 475M 0 475M 0% /dev tmpfs 489M 156K 489M 1% /dev/shm tmpfs 489M 7.1M 482M 2% /run tmpfs 489M 0 489M 0% /sys/fs/cgroup /dev/sr0 3.8G 3.8G 0 100% /mnt /dev/sda1 497M 138M 359M 28% /boot tmpfs 98M 4.0K 98M 1% /run/user/42 tmpfs 98M 12K 98M 1% /run/user/1000 [root@zq ~]# resize2fs /dev/zq/mylv resize2fs 1.42.9 (28-Dec-2013) Resizing the filesystem on /dev/zq/mylv to 4980736 (4k) blocks. The filesystem on /dev/zq/mylv is now 4980736 blocks long. [root@zq ~]# df -h 文件系统 容量 已用 可用 已用% 挂载点 /dev/sda3 20G 3.2G 17G 16% / devtmpfs 475M 0 475M 0% /dev tmpfs 489M 156K 489M 1% /dev/shm tmpfs 489M 7.1M 482M 2% /run tmpfs 489M 0 489M 0% /sys/fs/cgroup /dev/sr0 3.8G 3.8G 0 100% /mnt /dev/sda1 497M 138M 359M 28% /boot tmpfs 98M 4.0K 98M 1% /run/user/42 tmpfs 98M 12K 98M 1% /run/user/1000 [root@zq ~]# ^C [root@zq ~]# vgs VG #PV #LV #SN Attr VSize VFree zq 2 1 0 wz--n- 19.99g 1016.00m [root@zq ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert mylv zq -wi-a----- 19.00g [root@zq ~]# mount sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime) proc on /proc type proc (rw,nosuid,nodev,noexec,relatime) devtmpfs on /dev type devtmpfs (rw,nosuid,size=486124k,nr_inodes=121531,mode=755) securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime) tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev) devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000) tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755) tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755) cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd) pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime) cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event) cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory) cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices) cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer) cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls) cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb) cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset) cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio) cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu) configfs on /sys/kernel/config type configfs (rw,relatime) /dev/sda3 on / type xfs (rw,relatime,attr2,inode64,noquota) systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=25,pgrp=1,timeout=300,minproto=5,maxproto=5,direct) hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime) mqueue on /dev/mqueue type mqueue (rw,relatime) debugfs on /sys/kernel/debug type debugfs (rw,relatime) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime) nfsd on /proc/fs/nfsd type nfsd (rw,relatime) /dev/sr0 on /mnt type iso9660 (ro,relatime) /dev/sda1 on /boot type xfs (rw,relatime,attr2,inode64,noquota) tmpfs on /run/user/42 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700,uid=42,gid=42) fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime) tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700,uid=1000,gid=1000) gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000) [root@zq ~]# mount /dev/zq/mylv /mnt/ [root@zq ~]# mount sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime) proc on /proc type proc (rw,nosuid,nodev,noexec,relatime) devtmpfs on /dev type devtmpfs (rw,nosuid,size=486124k,nr_inodes=121531,mode=755) securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime) tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev) devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000) tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755) tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755) cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd) pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime) cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event) cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory) cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices) cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer) cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls) cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb) cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset) cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio) cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu) configfs on /sys/kernel/config type configfs (rw,relatime) /dev/sda3 on / type xfs (rw,relatime,attr2,inode64,noquota) systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=25,pgrp=1,timeout=300,minproto=5,maxproto=5,direct) hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime) mqueue on /dev/mqueue type mqueue (rw,relatime) debugfs on /sys/kernel/debug type debugfs (rw,relatime) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime) nfsd on /proc/fs/nfsd type nfsd (rw,relatime) /dev/sr0 on /mnt type iso9660 (ro,relatime) /dev/sda1 on /boot type xfs (rw,relatime,attr2,inode64,noquota) tmpfs on /run/user/42 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700,uid=42,gid=42) fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime) tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700,uid=1000,gid=1000) gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000) /dev/mapper/zq-mylv on /mnt type ext4 (rw,relatime,data=ordered) [root@zq ~]# df -h 文件系统 容量 已用 可用 已用% 挂载点 /dev/sda3 20G 3.2G 17G 16% / devtmpfs 475M 0 475M 0% /dev tmpfs 489M 156K 489M 1% /dev/shm tmpfs 489M 7.1M 482M 2% /run tmpfs 489M 0 489M 0% /sys/fs/cgroup /dev/mapper/zq-mylv 19G 11M 18G 1% /mnt /dev/sda1 497M 138M 359M 28% /boot tmpfs 98M 4.0K 98M 1% /run/user/42 tmpfs 98M 12K 98M 1% /run/user/1000
拉伸，更新，挂载，查看都得注意，不过拉伸的时候注意先后顺序pv，vg，lv
加入我们现在想再扩充空间
[root@zq ~]# vgdisplay --- Volume group --- VG Name zq System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 2 #显示只有两块物理磁盘 Act PV 2 VG Size 19.99 GiB PE Size 4.00 MiB Total PE 5118 Alloc PE / Size 4864 / 19.00 GiB Free PE / Size 254 / 1016.00 MiB #剩余的空间不到1g 怎么办 VG UUID 0wgWs7-WGXn-QwvV-4ccu-Jmut-fQPI-dspeby
[root@zq ~]# pvs #显示只有两块物理磁盘 PV VG Fmt Attr PSize PFree /dev/sdb zq lvm2 a-- 10.00g 0 /dev/sdc zq lvm2 a-- 10.00g 1016.00m
现在我们首先添加物理磁盘然后卷组扩展进来把新添加的pv，后面的顺序依次扩展就可以了
缩小一个逻辑卷（逻辑卷的缩小操作必须离线执行，要卸载逻辑卷）
1、卸载已经挂载的逻辑卷 umount /dev/zq/mylv
2、缩小文件系统（会提示需要运行fsck检查文件系统）resize2fs /dev/zq/mylv 1G 切记先缩小文件系统跟扩展的时候恰恰相反，缩小为1g
3、缩小LV lvreduce -L -1G /dev/zq/mylv
4、查看缩小后的LV lvdispaly
5、挂载 mount /dev/zq/mylv /mnt
[root@zq ~]# e2fsck -f /dev/zq/mylv #检查磁盘损坏 -f 遇到一切错误跳过不提示 e2fsck 1.42.9 (28-Dec-2013) 第一步: 检查inode,块,和大小 第二步: 检查目录结构 第3步: 检查目录连接性 Pass 4: Checking reference counts 第5步: 检查簇概要信息 /dev/zq/mylv: 12/1245184 files (0.0% non-contiguous), 97345/4980736 blocks
[root@zq ~]# mount sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime) proc on /proc type proc (rw,nosuid,nodev,noexec,relatime) devtmpfs on /dev type devtmpfs (rw,nosuid,size=486124k,nr_inodes=121531,mode=755) securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime) tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev) devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000) tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755) tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755) cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd) pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime) cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event) cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory) cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices) cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer) cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls) cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb) cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset) cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio) cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu) configfs on /sys/kernel/config type configfs (rw,relatime) /dev/sda3 on / type xfs (rw,relatime,attr2,inode64,noquota) systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=25,pgrp=1,timeout=300,minproto=5,maxproto=5,direct) hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime) mqueue on /dev/mqueue type mqueue (rw,relatime) debugfs on /sys/kernel/debug type debugfs (rw,relatime) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime) nfsd on /proc/fs/nfsd type nfsd (rw,relatime) /dev/sr0 on /mnt type iso9660 (ro,relatime) /dev/sda1 on /boot type xfs (rw,relatime,attr2,inode64,noquota) tmpfs on /run/user/42 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700,uid=42,gid=42) fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime) tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700,uid=1000,gid=1000) gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000) /dev/mapper/zq-mylv on /mnt type ext4 (rw,relatime,data=ordered) tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700) [root@zq ~]# umount /mnt/ [root@zq ~]# mount sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime) proc on /proc type proc (rw,nosuid,nodev,noexec,relatime) devtmpfs on /dev type devtmpfs (rw,nosuid,size=486124k,nr_inodes=121531,mode=755) securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime) tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev) devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000) tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755) tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755) cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd) pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime) cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event) cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory) cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices) cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer) cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls) cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb) cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset) cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio) cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu) configfs on /sys/kernel/config type configfs (rw,relatime) /dev/sda3 on / type xfs (rw,relatime,attr2,inode64,noquota) systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=25,pgrp=1,timeout=300,minproto=5,maxproto=5,direct) hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime) mqueue on /dev/mqueue type mqueue (rw,relatime) debugfs on /sys/kernel/debug type debugfs (rw,relatime) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime) nfsd on /proc/fs/nfsd type nfsd (rw,relatime) /dev/sr0 on /mnt type iso9660 (ro,relatime) /dev/sda1 on /boot type xfs (rw,relatime,attr2,inode64,noquota) tmpfs on /run/user/42 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700,uid=42,gid=42) fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime) tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700,uid=1000,gid=1000) gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000) tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700) [root@zq ~]# [root@zq ~]# resize2fs /dev/zq/mylv 10G resize2fs 1.42.9 (28-Dec-2013) 请先运行 'e2fsck -f /dev/zq/mylv'. [root@zq ~]# e2fsck -f /dev/zq/mylv e2fsck 1.42.9 (28-Dec-2013) 第一步: 检查inode,块,和大小 第二步: 检查目录结构 第3步: 检查目录连接性 Pass 4: Checking reference counts 第5步: 检查簇概要信息 /dev/zq/mylv: 12/1245184 files (0.0% non-contiguous), 97345/4980736 blocks [root@zq ~]# resize2fs /dev/zq/mylv 10G resize2fs 1.42.9 (28-Dec-2013) Resizing the filesystem on /dev/zq/mylv to 2621440 (4k) blocks. The filesystem on /dev/zq/mylv is now 2621440 blocks long. [root@zq ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert mylv zq -wi-a----- 19.00g [root@zq ~]# lvreduce -L -9G /dev/zq/mylv WARNING: Reducing active logical volume to 10.00 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce mylv? [y/n]: y Size of logical volume zq/mylv changed from 19.00 GiB (4864 extents) to 10.00 GiB (2560 extents). Logical volume mylv successfully resized. [root@zq ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert mylv zq -wi-a----- 10.00g [root@zq ~]# mount /dev/zq/mylv /mnt/ [root@zq ~]# mount sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime) proc on /proc type proc (rw,nosuid,nodev,noexec,relatime) devtmpfs on /dev type devtmpfs (rw,nosuid,size=486124k,nr_inodes=121531,mode=755) securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime) tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev) devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000) tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755) tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755) cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd) pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime) cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event) cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory) cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices) cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer) cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls) cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb) cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset) cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio) cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu) configfs on /sys/kernel/config type configfs (rw,relatime) /dev/sda3 on / type xfs (rw,relatime,attr2,inode64,noquota) systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=25,pgrp=1,timeout=300,minproto=5,maxproto=5,direct) hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime) mqueue on /dev/mqueue type mqueue (rw,relatime) debugfs on /sys/kernel/debug type debugfs (rw,relatime) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime) nfsd on /proc/fs/nfsd type nfsd (rw,relatime) /dev/sr0 on /mnt type iso9660 (ro,relatime) /dev/sda1 on /boot type xfs (rw,relatime,attr2,inode64,noquota) tmpfs on /run/user/42 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700,uid=42,gid=42) fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime) tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700,uid=1000,gid=1000) gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000) tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=100136k,mode=700) /dev/mapper/zq-mylv on /mnt type ext4 (rw,relatime,data=ordered)
缩小这块操作要小心，可能损坏大小，所以缩小的时候尽量做一个误差出来