CentOS Stream 10
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LVM : Configure Mirroring Volume2024/12/27
 

Configure Mirroring Volumes. It is like RAID 1.

[1] For example, create a Mirroring Volume with Physical Volume [/dev/sdb1] and [/dev/sdc1].
# create volume group [vg_mirror] with [/dev/sdb1] and [/dev/sdc1]

[root@dlp ~]#
vgcreate vg_mirror /dev/sdb1 /dev/sdc1 

  Volume group "vg_mirror" successfully created
# create a mirroring volume

[root@dlp ~]#
lvcreate -L 50G -m1 -n lv_mirror vg_mirror 

[   88.658088] raid6: skipped pq benchmark and selected avx512x4
[   88.658095] raid6: using avx512x2 recovery algorithm
[   88.659560] async_tx: api initialized (async)
[   88.661026] xor: automatically using best checksumming function   avx
[   88.722878] device-mapper: raid: Superblocks created for new raid set
[   88.733129] md/raid1:mdX: not clean -- starting background reconstruction
[   88.733135] md/raid1:mdX: active with 2 out of 2 mirrors
[   88.760839] mdX: bitmap file is out of date, doing full recovery
[   88.765572] md: resync of RAID array mdX
  Logical volume "lv_mirror" created.
[root@dlp ~]#
lvdisplay /dev/vg_mirror/lv_mirror 

  --- Logical volume ---
  LV Path                /dev/vg_mirror/lv_mirror
  LV Name                lv_mirror
  VG Name                vg_mirror
  LV UUID                cUwCVy-Bkdp-CifE-kAwu-rLaW-k1HZ-vgnmiE
  LV Write Access        read/write
  LV Creation host, time dlp.srv.world, 2024-12-27 09:55:03 +0900
  LV Status              available
  # open                 0
  LV Size                50.00 GiB
  Current LE             12800
  Mirrored volumes       2
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:7
[2] If you'd like to set mirroring volume from a normal logical volume which is already running, Configure like follows.
# extend the volume group

[root@dlp ~]#
vgextend vg_data /dev/sdc1 

  Volume group "vg_data" successfully extended
# set mirroring volume

[root@dlp ~]#
lvconvert -m1 /dev/vg_data/lv_data /dev/sdc1 

Are you sure you want to convert linear LV vg_data/lv_data to raid1 with 2 images enhancing resilience? [y/n]: y
[  284.587442] device-mapper: raid: Device 1 specified for rebuild; clearing superblock
[  284.587449] device-mapper: raid: Superblocks created for new raid set
[  284.600591] md/raid1:mdX: active with 1 out of 2 mirrors
[  284.610769] mdX: bitmap file is out of date, doing full recovery
[  284.624064] md: recover of RAID array mdX
  Logical volume vg_data/lv_data successfully converted.
# verify status

# complete to sync if [Cpy%Sync] turns to [100]

[root@dlp ~]#
lvs 

  LV      VG      Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home    cs      -wi-ao---- <23.34g
  root    cs      -wi-ao----  47.79g
  swap    cs      -wi-ao----  <7.87g
  lv_data vg_data rwi-a-r---  30.00g                                    10.18
[root@dlp ~]#
lvs 

  LV      VG      Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home    cs      -wi-ao---- <23.34g
  root    cs      -wi-ao----  47.79g
  swap    cs      -wi-ao----  <7.87g
  lv_data vg_data rwi-a-r---  30.00g                                    100.00
[3] Unset Mirroring Volume like follows if you want.
# specify -m0 to unset

[root@dlp ~]#
lvconvert -m0 /dev/vg_data/lv_data 

Are you sure you want to convert raid1 LV vg_data/lv_data to type linear losing all resilience? [y/n]: y
  Logical volume vg_data/lv_data successfully converted.
[root@dlp ~]#
lvs -a -o vg_name,name,devices,size 

  VG      LV      Devices         LSize
  cs      home    /dev/sda3(2014) <23.34g
  cs      root    /dev/sda3(7988)  47.79g
  cs      swap    /dev/sda3(0)     <7.87g
  vg_data lv_data /dev/sdb1(0)     30.00g
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