論理ボリュームのミラーリング2015/07/18 |
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。 |
# /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 Logical volume "vg_mirror" created # ミラー論理ボリューム作成 [root@dlp ~]# lvcreate -L 50G -m1 -n lv_mirror vg_mirror [ 5133.283498] device-mapper: raid: Superblocks created for new array [ 5133.285922] md/raid1:mdX: not clean -- starting background reconstruction [ 5133.287095] md/raid1:mdX: active with 2 out of 2 mirrors [ 5133.287932] Choosing daemon_sleep default (5 sec) [ 5133.288688] created bitmap (50 pages) for device mdX [ 5133.334556] mdX: bitmap file is out of date, doing full recovery [ 5133.667257] mdX: bitmap initialized from disk: read 4 pages, set 102400 of 102400 bits [ 5133.747852] md: resync of RAID array mdX [ 5133.748596] md: minimum _guaranteed_ speed: 1000 KB/sec/disk. [ 5133.749676] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for resync. [ 5133.751277] md: using 128k window, over a total of 52428800k. 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 P8dakZ-TiWn-T6b5-y6A7-Ecty-ieRZ-vGZAWX LV Write Access read/write LV Creation host, time dlp.srv.world, 2015-07-20 13:18:20 +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。 |
# 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 [ 5710.014313] device-mapper: raid: Superblocks created for new array [ 5710.019478] md/raid1:mdX: not clean -- starting background reconstruction [ 5710.020597] md/raid1:mdX: active with 2 out of 2 mirrors [ 5710.021499] Choosing daemon_sleep default (5 sec) [ 5710.022279] created bitmap (50 pages) for device mdX [ 5710.173412] mdX: bitmap file is out of date, doing full recovery [ 5710.466100] mdX: bitmap initialized from disk: read 4 pages, set 102400 of 102400 bits [ 5710.567058] md: resync of RAID array mdX [ 5710.567705] md: minimum _guaranteed_ speed: 1000 KB/sec/disk. [ 5710.568658] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for resync. [ 5710.570204] md: using 128k window, over a total of 52428800k. # 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 centos -wi-ao---- 45.62g swap centos -wi-ao---- 3.89g lv_data vg_data rwi-a-r--- 50.00g 1.34 |
[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。 |
# -m0 で解除 [root@dlp ~]# lvconvert -m0 /dev/vg_data/lv_data [root@dlp ~]# lvs -a -o vg_name,name,devices,size VG LV Devices LSize centos root /dev/sda2(996) 45.62g centos swap /dev/sda2(0) 3.89g vg_data lv_data /dev/sdb1(0) 50.00g |
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