Create Mirroring Volume2025/08/13

	Create Mirroring Volume.
[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 mirroring volume

root@dlp:~#

lvcreate -L 50G -m1 -n lv_mirror vg_mirror

  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                im5xyb-G4FM-rFR7-jHS9-k4Wa-zmJU-NjZhTL
  LV Write Access        read/write
  LV Creation host, time dlp.srv.world, 2025-08-12 15:18:05 +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     256
  Block device           253:6

[2]	Configure like follows if you'd like to set mirroring volume from a logical volume which is already running.

# extend volume group

root@dlp:~#

vgextend vg_dlp /dev/sdc1

  Volume group "vg_dlp" successfully extended

# set mirror volume

root@dlp:~#

lvconvert -m1 /dev/vg_dlp/lv_data /dev/sdc1

Are you sure you want to convert linear LV vg_dlp/lv_data to raid1 with 2 images enhancing resilience? [y/n]: y
  Logical volume vg_dlp/lv_data successfully converted.

# confirm : 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
  root      debian-vg -wi-ao---- 74.98g
  swap_1    debian-vg -wi-ao---- <4.06g
  lv_mirror vg_mirror rwi-a-r--- 50.00g                                    17.99

[3]	Unset Mirroring Volume.

# specify -m0 to unset

root@dlp:~#

lvconvert -m0 /dev/vg_mirror/lv_mirror

Are you sure you want to convert raid1 LV vg_mirror/lv_mirror to type linear losing all resilience? [y/n]: y
  Logical volume vg_mirror/lv_mirror successfully converted.

root@dlp:~#

lvs -a -o vg_name,name,devices,size

  VG        LV        Devices          LSize
  debian-vg root      /dev/vda5(0)     74.98g
  debian-vg swap_1    /dev/vda5(19196) <4.06g
  vg_mirror lv_mirror /dev/vdb1(1)     50.00g

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