备份逻辑卷

一 备份逻辑卷

     1 查看逻辑卷大小 lvdisplay /dev/sonny/xiaofeng

[root@linuxprobe ~]# lvdisplay /dev/sonny/xiaofeng
  --- Logical volume ---
  LV Path                /dev/sonny/xiaofeng
  LV Name                xiaofeng
  VG Name                sonny
  LV UUID                Z5JCJH-WgjQ-RG4Q-aAyw-MMt3-fDos-G7JCIU
  LV Write Access        read/write
  LV Creation host, time linuxprobe.com, 2021-07-04 19:20:56 +0800
  LV Status              available
  # open                 1
  LV Size                300.00 MiB
  Current LE             75
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:2

     2 创建备份,大小300M，备份名SNAP  lvcreate -L 300M -s -n SNAP /dev/sonny/xiaofeng

[root@linuxprobe ~]# lvcreate -L 300M -s -n SNAP /dev/sonny/xiaofeng
  Logical volume "SNAP" created.

    3 查看备份卷 lvdisplay /dev/sonny/SNAP

@linuxprobe ~]# lvdisplay /dev/sonny/SNAP
  --- Logical volume ---
  LV Path                /dev/sonny/SNAP
  LV Name                SNAP
  VG Name                sonny
  LV UUID                EjAqU5-rFxs-2XKG-SVac-9fcw-1Uq1-EFZtqO
  LV Write Access        read/write
  LV Creation host, time linuxprobe.com, 2021-07-04 23:10:59 +0800
  LV snapshot status     active destination for xiaofeng
  LV Status              available
  # open                 0
  LV Size                300.00 MiB
  Current LE             75
  COW-table size         300.00 MiB
  COW-table LE           75
  Allocated to snapshot  0.01%
  Snapshot chunk size    4.00 KiB
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:5

二 从备份恢复

     1 卸载逻辑卷   umount /dev/sonny/xiaofeng

[root@linuxprobe ~]# umount /dev/sonny/xiaofeng

     2 恢复快照卷   lvconvert --merge /dev/sonny/SNAP

[root@linuxprobe ~]# lvconvert --merge /dev/sonny/SNAP
  Merging of volume sonny/SNAP started.
  sonny/xiaofeng: Merged: 100.00%

三 重新挂载

     1  重新挂载  mount -a

[root@linuxprobe ~]# mount -a

     2  查看挂载情况  df -hT|grep xiaofeng

[root@linuxprobe ~]# df -hT|grep xiaofeng
/dev/mapper/sonny-xiaofeng ext4      283M  2.1M  262M   1% /root/new_disk/lv/xiaofeng