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  • How to Check Device UUID or File System UUID. (Doc ID 1505398.1)

    How to Check Device UUID or File System UUID. (Doc ID 1505398.1)

    APPLIES TO:

    Linux OS - Version Oracle Linux 5.0 and later
    Oracle Cloud Infrastructure - Version N/A and later
    Linux x86-64
    Linux x86

    GOAL

    In Linux, sometimes the name of devices or file systems are not persistent which will bring system in trouble, in such situation specify UUID (universally unique identifier) is the solution to identify the only unique component in the system.

    SOLUTION

    1. Device uuid

    In OL5.x:

    # scsi_id -u -g -s /block/sda
    35000c50032387713

    In OL6.x:

    # scsi_id --whitelisted /dev/sdd
    3600144f0da627ad70000503ad6ce0006

    Or:

    # udevadm info --query=all --path=/sys/block/sda
    P: /devices/pci0000:00/0000:00:01.0/0000:01:00.0/host0/target0:2:0/0:2:0:0/block/sda
    N: sda
    W: 99
    S: block/8:0
    S: disk/by-id/scsi-364403a78570b200018ac2cd20575ec04
    S: disk/by-path/pci-0000:01:00.0-scsi-0:2:0:0
    S: disk/by-id/wwn-0x64403a78570b200018ac2cd20575ec04
    E: UDEV_LOG=3
    E: DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/host0/target0:2:0/0:2:0:0/block/sda
    E: MAJOR=8
    E: MINOR=0
    E: DEVNAME=/dev/sda
    E: DEVTYPE=disk
    E: SUBSYSTEM=block
    E: MPATH_SBIN_PATH=/sbin
    E: ID_SCSI=1
    E: ID_VENDOR=LSI
    E: ID_VENDOR_ENC=LSI
    E: ID_MODEL=MRSASRoMB-4i
    E: ID_MODEL_ENC=MRSASRoMB-4i
    E: ID_REVISION=2.12
    E: ID_TYPE=disk
    E: ID_SERIAL_RAW=364403a78570b200018ac2cd20575ec04
    E: ID_SERIAL=364403a78570b200018ac2cd20575ec04
    E: ID_SERIAL_SHORT=64403a78570b200018ac2cd20575ec04
    E: ID_WWN=0x64403a78570b2000
    E: ID_WWN_VENDOR_EXTENSION=0x18ac2cd20575ec04
    E: ID_WWN_WITH_EXTENSION=0x64403a78570b200018ac2cd20575ec04
    E: ID_SCSI_SERIAL=0004ec7505d22cac1800200b57783a40
    E: ID_BUS=scsi
    E: ID_PATH=pci-0000:01:00.0-scsi-0:2:0:0
    E: ID_PART_TABLE_TYPE=dos
    E: LVM_SBIN_PATH=/sbin
    E: DEVLINKS=/dev/block/8:0 /dev/disk/by-id/scsi-364403a78570b200018ac2cd20575ec04 /dev/disk/by-path/pci-0000:01:00.0-scsi-0:2:0:0 /dev/disk/by-id/wwn-0x64403a78570b200018ac2cd20575ec04

    For multipath devices:

    # multipath -ll -v
    
    360080e500024a048000004044f3c64ee dm-0 SUN,LCSM100_F
    size=95G features='1 queue_if_no_path' hwhandler='1 rdac' wp=rw
    |-+- policy='round-robin 0' prio=6 status=active
    | `- 7:0:0:0 sdb 8:16  active ready running
    `-+- policy='round-robin 0' prio=1 status=enabled
      `- 8:0:0:0 sdk 8:160 active ghost running

    Note: the device uuid is fixed value, the uuid of dm-mp device should be identical with the uuid of its paths. In most of situation could not be modified unless the device supports dynamic uuid feature.

    Usage:

    The device uuid often being used to persistent the device name or dm-mpath name, following example bind the wwid with name oraasm1 persistently.

           multipath {
                   wwid                  36006048caf0b141598afa8e2875797a1
                   alias                   oraasm1
           }

    Note: the partition (such as sda1 sdb1) does not have uuid.

    2. File system uuid

    In OL5.x:

    # blkid /dev/sda1
    /dev/sda1: LABEL="/boot1" UUID="ae298adb-1b94-42a0-9dc9-a121c7561a5b" TYPE="ext3" SEC_TYPE="ext2"
    
    # /lib/udev/vol_id /dev/sda1
    ID_FS_USAGE=filesystem
    ID_FS_TYPE=ext3
    ID_FS_VERSION=1.0
    ID_FS_UUID=ae298adb-1b94-42a0-9dc9-a121c7561a5b
    ID_FS_LABEL=/boot1
    ID_FS_LABEL_SAFE=boot1
    

    Note: the /dev/sdxx must be formated as file system.

    Usage:

    Could specify uuid in /etc/fstab to bind the device with mount directory persistently.

    UUID=xxx-xxx-xxx-xxx            /mount_dir                   ext3    defaults        1 2

    Note: file system uuid will be changed after re-create file system.

    3. LVM2 uuid

    # pvs -v
      PV         VG   Fmt  Attr PSize  PFree  DevSize PV UUID   
      /dev/sda2  vg0  lvm2 a--  48.81G     0   48.83G xCJzmN-oJmL-kMFl-JCrb-lfoH-movY-6x6K6O
      /dev/sda3  vg0  lvm2 a--  48.81G     0   48.83G 9iXmmM-kKqV-OYDb-eSVN-ymCw-wwVk-uY6fXo
    
    # lvs
      LV       VG   #Seg Attr   LSize   Maj Min KMaj KMin Origin Snap%  Move Copy%  Log Convert LV UUID                               
      lvroot   vg0     3 -wi-ao 146.44G  -1  -1 253  0                                          C0l0R2-KhH8-N7Nk-BhXn-MJhS-35dn-XXdL1B
      lvasmlib vg1     1 -wi-a-   4.88G  -1  -1 253  6                                          5nlcKy-1kvs-l7qb-eIts-tEs6-E2JG-RisWDx
    
    # vgs -v
      VG   Attr   Ext    #PV #LV #SN VSize   VFree  VG UUID                               
      vg0  wz--n- 32.00M   3   1   0 146.44G     0  ereADB-2w9v-O2P9-58OS-RN9Q-t2pV-8wXpSc
      vg1  wz--n-  4.00M   3   3   0 139.71G  9.95G LczKdV-Nq82-lNrr-EmI1-cerd-numb-1qV6m4

    Usage:

    In some case need recover some pv device, use the --uuid and --restorefile arguments of the pvcreate command to restore the physical volume. The following command restores the physical volume label with the backuped metadata.

    # pvcreate --uuid "0YnHNn-1COx-dohx-bwPf-aLyl-pO8F-f5PI5R" --restorefile /etc/lvm/archive/vg0_00000-1324010847.vg /dev/sda2
      Physical volume "/dev/sda2" successfully created

    Note: lvm2 uuid will be changed after re-create.

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  • 原文地址:https://www.cnblogs.com/zylong-sys/p/11975092.html
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