LVM : 論理ボリュームのミラーリング2022/07/07 |
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ミラーリング論理ボリュームの作成方法です。
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| [1] | 例として、物理ボリューム [/dev/sdb1] と [/dev/sdc1] を使用してミラーリングボリュームを作成します。 |
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# [/dev/sdb1] と [/dev/sdc1] でボリュームグループ [vg_mirror] を作成 [root@dlp ~]# vgcreate vg_mirror /dev/sdb1 /dev/sdc1 Volume group "vg_mirror" successfully created # ミラー論理ボリューム作成 [root@dlp ~]# lvcreate -L 50G -m1 -n lv_mirror vg_mirror [ 2063.377949] raid6: skip pq benchmark and using algorithm avx2x4 [ 2063.379250] raid6: using avx2x2 recovery algorithm [ 2063.382543] async_tx: api initialized (async) [ 2063.404995] device-mapper: raid: Loading target version 1.15.1 [ 2063.479381] device-mapper: raid: Superblocks created for new raid set [ 2063.490722] md/raid1:mdX: not clean -- starting background reconstruction [ 2063.492076] md/raid1:mdX: active with 2 out of 2 mirrors [ 2063.817349] mdX: bitmap file is out of date, doing full recovery [ 2063.849297] md: resync of RAID array mdX Logical volume "lv_mirror" created.[root@dlp ~]# lvdisplay /dev/vg_mirror/lv_mirror ---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 SUI0os-ZfYw-ns5H-bnbz-UPf0-KHhv-CuemyB LV Write Access read/write LV Creation host, time dlp.srv.world, 2022-07-07 15:07:33 +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] | すでに稼働中の論理ボリュームをミラー化する場合は以下のように設定します。 |
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# ボリュームグループ拡張 [root@dlp ~]# vgextend vg_data /dev/sdc1 Volume group "vg_data" successfully extended # 論理ボリュームミラー化 [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
[ 2263.044511] device-mapper: raid: Device 1 specified for rebuild; clearing superblock
[ 2263.046045] device-mapper: raid: Superblocks created for new raid set
[ 2263.051592] md/raid1:mdX: active with 1 out of 2 mirrors
[ 2263.140399] mdX: bitmap file is out of date, doing full recovery
[ 2263.180629] md: recovery of RAID array mdX
Logical volume vg_data/lv_data successfully converted.
# 確認 : [Cpy%Sync] が [100] でデータ同期完了 [root@dlp ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root cs -wi-ao---- 71.00g swap cs -wi-ao---- 7.88g lv_data vg_data rwi-a-r--- 30.00g 15.70[root@dlp ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root cs -wi-ao---- 71.00g swap cs -wi-ao---- 7.88g lv_data vg_data rwi-a-r--- 30.00g 100.00 |
| [3] | 論理ボリュームのミラー化を解除する場合は以下のように設定します。 |
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# -m0 で解除 [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 root /dev/sda2(7990) 71.00g cs root /dev/sda2(2018) 71.00g cs swap /dev/sda2(0) 7.88g vg_data lv_data /dev/sdb1(0) 30.00g |
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