LVM : 論理ボリュームのミラーリング2021/07/20 |
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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 [ 211.634519] raid6: sse2x1 gen() 13407 MB/s [ 211.651498] raid6: sse2x1 xor() 7802 MB/s [ 211.668499] raid6: sse2x2 gen() 14909 MB/s [ 211.685497] raid6: sse2x2 xor() 9596 MB/s [ 211.702474] raid6: sse2x4 gen() 15373 MB/s [ 211.719495] raid6: sse2x4 xor() 6706 MB/s [ 211.736494] raid6: avx2x1 gen() 25409 MB/s [ 211.753492] raid6: avx2x1 xor() 14189 MB/s [ 211.770470] raid6: avx2x2 gen() 28151 MB/s [ 211.787491] raid6: avx2x2 xor() 16780 MB/s [ 211.804490] raid6: avx2x4 gen() 28382 MB/s [ 211.821489] raid6: avx2x4 xor() 9060 MB/s [ 211.822143] raid6: using algorithm avx2x4 gen() 28382 MB/s [ 211.822944] raid6: .... xor() 9060 MB/s, rmw enabled [ 211.823668] raid6: using avx2x2 recovery algorithm [ 211.825543] async_tx: api initialized (async) [ 211.827868] xor: automatically using best checksumming function avx [ 211.848178] device-mapper: raid: Loading target version 1.15.1 [ 211.966127] device-mapper: raid: Superblocks created for new raid set [ 211.997568] md/raid1:mdX: not clean -- starting background reconstruction [ 211.998611] md/raid1:mdX: active with 2 out of 2 mirrors [ 212.239445] mdX: bitmap file is out of date, doing full recovery [ 212.295174] md: resync of RAID array mdX Logical volume "lv_mirror" created.[root@dlp ~]# lvdisplay /dev/vg_mirror/lv_mirror --- Logical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 H8a1z5-r759-QLqb-kIyf-CU4H-RGUd-6kgnRb LV Write Access read/write LV Creation host, time dlp.srv.world, 2021-07-20 20:08:18 +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 253:6 |
| [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_dlp /dev/sdc1 Volume group "vg_dlp" successfully extended # 論理ボリュームミラー化 [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
[ 2448.363275] device-mapper: raid: Device 1 specified for rebuild; clearing superblock
[ 2448.364539] device-mapper: raid: Superblocks created for new raid set
[ 2448.374732] md/raid1:mdX: active with 1 out of 2 mirrors
[ 2448.518744] mdX: bitmap file is out of date, doing full recovery
[ 2448.579886] md: recovery of RAID array mdX
Logical volume vg_dlp/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 rl -wi-ao---- <26.00g swap rl -wi-ao---- 3.00g lv_data vg_dlp rwi-a-r--- 30.00g 15.70[root@dlp ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root rl -wi-ao---- <26.00g swap rl -wi-ao---- 3.00g lv_data vg_dlp 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_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 rl root /dev/sda2(768) <26.00g rl swap /dev/sda2(0) 3.00g vg_mirror lv_mirror /dev/sdb1(1) 50.00g |
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