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ソフトウェアRAID
環境
Arm64のKVMで動かす Debian12の仮想環境でテストします。
mdadm の他に、パーティション作成で利用する parted もインストールします。
# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
# cat /etc/debian_version
12.0
# apt-get install --no-install-recommends mdadm parted
利用するパーティションを切ります。
vdb1 と vdc1 で raid を組む想定です。
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
vda 254:0 0 16G 0 disk
|-vda1 254:1 0 487M 0 part /boot
|-vda2 254:2 0 15.1G 0 part /
`-vda3 254:3 0 465M 0 part [SWAP]
vdb 254:16 0 8G 0 disk
vdc 254:32 0 8G 0 disk
# parted --script /dev/vdb -- mklabel msdos mkpart primary 0% 100% print
Model: Virtio Block Device (virtblk)
Disk /dev/vdb: 8590MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 8590MB 8589MB primary lba
# parted --script /dev/vdc -- mklabel msdos mkpart primary 0% 100% print
Model: Virtio Block Device (virtblk)
Disk /dev/vdc: 8590MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 8590MB 8589MB primary lba
raid0
vdb1 と vdc1 で raid0 を組みます。
# mdadm --create /dev/md0 -l raid0 -n 2 /dev/vdb1 /dev/vdc1
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
結果を確認します。
# cat /proc/mdstat
Personalities : [raid0]
md0 : active raid0 vdc1[1] vdb1[0]
16764928 blocks super 1.2 512k chunks
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Sep 24 10:46:36 2023
Raid Level : raid0
Array Size : 16764928 (15.99 GiB 17.17 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Sun Sep 24 10:46:36 2023
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Layout : -unknown-
Chunk Size : 512K
Consistency Policy : none
Name : debian12:0 (local to host debian12)
UUID : 06c0ef59:9a700fc7:5803ba70:fabcd4e3
Events : 0
Number Major Minor RaidDevice State
0 254 17 0 active sync /dev/vdb1
1 254 33 1 active sync /dev/vdc1
OS再起動した時にも自動で raid が構成されるように、情報を保存します。
# mdadm --detail --scan
ARRAY /dev/md0 metadata=1.2 name=debian12:0 UUID=06c0ef59:9a700fc7:5803ba70:fabcd4e3
# mdadm --detail --scan | tee /etc/mdadm.conf
ARRAY /dev/md0 metadata=1.2 name=debian12:0 UUID=06c0ef59:9a700fc7:5803ba70:fabcd4e3
通常のパーティションと同じように、ファイルシステムを作成し、マウントポイントにマウントして利用します。
# mkfs -t ext4 /dev/md0
mke2fs 1.47.0 (5-Feb-2023)
Creating filesystem with 4191232 4k blocks and 1048576 inodes
Filesystem UUID: ee5fe7c1-003b-4d16-b143-b95c04e91dcf
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
停止と再開
停止します。
# mdadm --stop /dev/md0
mdadm: stopped /dev/md0
# cat /proc/mdstat
Personalities : [raid1] [raid0]
unused devices: <none>
再開します。
# mdadm --assemble /dev/md0 /dev/vdb1 /dev/vdc1
mdadm: /dev/md0 has been started with 2 drives.
# cat /proc/mdstat
Personalities : [raid1] [raid0]
md0 : active raid0 vdb1[0] vdc1[1]
16764928 blocks super 1.2 512k chunks
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Sep 26 07:42:37 2023
Raid Level : raid0
Array Size : 16764928 (15.99 GiB 17.17 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Tue Sep 26 07:42:37 2023
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Layout : -unknown-
Chunk Size : 512K
Consistency Policy : none
Name : debian12:0 (local to host debian12)
UUID : be6f1244:d1e04ccf:44b1e2b4:c7635f88
Events : 0
Number Major Minor RaidDevice State
0 254 17 0 active sync /dev/vdb1
1 254 33 1 active sync /dev/vdc1
利用終了
停止した後、スーパーブロックをクリアします。
# mdadm --stop /dev/md0
mdadm: stopped /dev/md0
# mdadm --zero-superblock /dev/vdb1 /dev/vdc1
# rm /etc/mdadm.conf
raid1
vdb1 と vdc1 で raid1 を組みます。
# mdadm --create /dev/md0 -l raid1 -n 2 /dev/vdb1 /dev/vdc1
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
結果を確認します。ミラーリングの同期が走ります。
# cat /proc/mdstat
Personalities : [raid0] [raid1]
md0 : active raid1 vdc1[1] vdb1[0]
8382464 blocks super 1.2 [2/2] [UU]
[===>.................] resync = 19.0% (1596032/8382464) finish=1.1min speed=99752K/sec
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Sep 24 10:51:09 2023
Raid Level : raid1
Array Size : 8382464 (7.99 GiB 8.58 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Sun Sep 24 10:51:38 2023
State : clean, resyncing
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Consistency Policy : resync
Resync Status : 37% complete
Name : debian12:0 (local to host debian12)
UUID : e6205a36:af6159e5:cfa82350:77ff5545
Events : 7
Number Major Minor RaidDevice State
0 254 17 0 active sync /dev/vdb1
1 254 33 1 active sync /dev/vdc1
同期が終了した状態
# cat /proc/mdstat
Personalities : [raid0] [raid1]
md0 : active raid1 vdc1[1] vdb1[0]
8382464 blocks super 1.2 [2/2] [UU]
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Sep 24 10:51:09 2023
Raid Level : raid1
Array Size : 8382464 (7.99 GiB 8.58 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Sun Sep 24 10:52:36 2023
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Consistency Policy : resync
Name : debian12:0 (local to host debian12)
UUID : e6205a36:af6159e5:cfa82350:77ff5545
Events : 18
Number Major Minor RaidDevice State
0 254 17 0 active sync /dev/vdb1
1 254 33 1 active sync /dev/vdc1
OS再起動した時にも自動で raid が構成されるように、情報を保存します。
# mdadm --detail --scan
ARRAY /dev/md0 metadata=1.2 name=debian12:0 UUID=e6205a36:af6159e5:cfa82350:77ff5545
# mdadm --detail --scan | tee /etc/mdadm.conf
ARRAY /dev/md0 metadata=1.2 name=debian12:0 UUID=e6205a36:af6159e5:cfa82350:77ff5545
ディスク交換の練習
交換するディスクに faulty のマークをします。
# mdadm --fail /dev/md0 /dev/vdb1
mdadm: set /dev/vdb1 faulty in /dev/md0
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 vdc1[2] vdb1[0](F)
8382464 blocks super 1.2 [2/1] [_U]
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Sep 24 11:00:01 2023
Raid Level : raid1
Array Size : 8382464 (7.99 GiB 8.58 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Tue Sep 26 06:48:34 2023
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 1
Spare Devices : 0
Consistency Policy : resync
Name : debian12:0 (local to host debian12)
UUID : bd41c118:e82d16bd:c3c01df0:38124705
Events : 48
Number Major Minor RaidDevice State
- 0 0 0 removed
2 254 33 1 active sync /dev/vdc1
0 254 17 - faulty /dev/vdb1
raid からディスクを除去します。
# mdadm --remove /dev/md0 /dev/vdb1
mdadm: hot removed /dev/vdb1 from /dev/md0
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 vdc1[2]
8382464 blocks super 1.2 [2/1] [_U]
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Sep 24 11:00:01 2023
Raid Level : raid1
Array Size : 8382464 (7.99 GiB 8.58 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent
Update Time : Tue Sep 26 06:50:03 2023
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Consistency Policy : resync
Name : debian12:0 (local to host debian12)
UUID : bd41c118:e82d16bd:c3c01df0:38124705
Events : 49
Number Major Minor RaidDevice State
- 0 0 0 removed
2 254 33 1 active sync /dev/vdc1
物理的に古いディスクを取り外し、新しいディスクを付けた後(仮想環境でテストしているの、論理的に、ですが)
最初と同様にパーティションを切ります。
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
vda 254:0 0 16G 0 disk
|-vda1 254:1 0 487M 0 part /boot
|-vda2 254:2 0 15.1G 0 part /
`-vda3 254:3 0 465M 0 part [SWAP]
vdb 254:16 0 8G 0 disk
vdc 254:32 0 8G 0 disk
`-vdc1 254:33 0 8G 0 part
`-md0 9:0 0 8G 0 raid1
# parted --script /dev/vdb -- mklabel msdos mkpart primary 0% 100% print
Model: Virtio Block Device (virtblk)
Disk /dev/vdb: 8590MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 8590MB 8589MB primary lba
準備したパーティションを raid に追加します。
# mdadm --add /dev/md0 /dev/vdb1
mdadm: added /dev/vdb1
同期が走ります。
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 vdb1[3] vdc1[2]
8382464 blocks super 1.2 [2/1] [_U]
[=>...................] recovery = 6.1% (516608/8382464) finish=0.7min speed=172202K/sec
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Sep 24 11:00:01 2023
Raid Level : raid1
Array Size : 8382464 (7.99 GiB 8.58 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Tue Sep 26 06:58:23 2023
State : clean, degraded, recovering
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
Consistency Policy : resync
Rebuild Status : 9% complete
Name : debian12:0 (local to host debian12)
UUID : bd41c118:e82d16bd:c3c01df0:38124705
Events : 53
Number Major Minor RaidDevice State
3 254 17 0 spare rebuilding /dev/vdb1
2 254 33 1 active sync /dev/vdc1
同期が終了した状態
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 vdb1[3] vdc1[2]
8382464 blocks super 1.2 [2/2] [UU]
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Sep 24 11:00:01 2023
Raid Level : raid1
Array Size : 8382464 (7.99 GiB 8.58 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Tue Sep 26 07:00:06 2023
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Consistency Policy : resync
Name : debian12:0 (local to host debian12)
UUID : bd41c118:e82d16bd:c3c01df0:38124705
Events : 69
Number Major Minor RaidDevice State
3 254 17 0 active sync /dev/vdb1
2 254 33 1 active sync /dev/vdc1
停止と再開
停止します。
# mdadm --stop /dev/md0
mdadm: stopped /dev/md0
# cat /proc/mdstat
Personalities : [raid1]
unused devices: <none>
再開します。
# mdadm --assemble /dev/md0 /dev/vdb1 /dev/vdc1
mdadm: /dev/md0 has been started with 2 drives.
# cat /proc/mdstat
Personalities : [raid1]
md0 : active (auto-read-only) raid1 vdb1[3] vdc1[2]
8382464 blocks super 1.2 [2/2] [UU]
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Sep 24 11:00:01 2023
Raid Level : raid1
Array Size : 8382464 (7.99 GiB 8.58 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Tue Sep 26 07:06:11 2023
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Consistency Policy : resync
Name : debian12:0 (local to host debian12)
UUID : bd41c118:e82d16bd:c3c01df0:38124705
Events : 69
Number Major Minor RaidDevice State
3 254 17 0 active sync /dev/vdb1
2 254 33 1 active sync /dev/vdc1
利用終了
停止した後、スーパーブロックをクリアします。
# mdadm --stop /dev/md0
mdadm: stopped /dev/md0
# mdadm --zero-superblock /dev/vdb1 /dev/vdc1
# rm /etc/mdadm.conf
raid5
vdb1、vdc1、vdd1、vde1 で raid5 を組む準備をします。
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
vda 254:0 0 16G 0 disk
|-vda1 254:1 0 487M 0 part /boot
|-vda2 254:2 0 15.1G 0 part /
`-vda3 254:3 0 465M 0 part [SWAP]
vdb 254:16 0 8G 0 disk
`-vdb1 254:17 0 8G 0 part
vdc 254:32 0 8G 0 disk
`-vdc1 254:33 0 8G 0 part
vdd 254:48 0 8G 0 disk
vde 254:64 0 8G 0 disk
# parted --script /dev/vdd -- mklabel msdos mkpart primary 0% 100% print
Model: Virtio Block Device (virtblk)
Disk /dev/vdd: 8590MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 8590MB 8589MB primary lba
# parted --script /dev/vde -- mklabel msdos mkpart primary 0% 100% prin
Model: Virtio Block Device (virtblk)
Disk /dev/vde: 8590MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 8590MB 8589MB primary lba
raid5 を組みます。vde1 はスペアディスクとします。
# mdadm --create /dev/md0 -l raid5 -n 3 /dev/vdb1 /dev/vdc1 /dev/vdd1 --spare-devices=1 /dev/vde1
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
結果を確認します。ミラーリングの同期が走ります。
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 vdd1[4] vde1[3](S) vdc1[1] vdb1[0]
16764928 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_]
[>....................] recovery = 4.7% (395772/8382464) finish=2.3min speed=56538K/sec
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Wed Sep 27 05:19:06 2023
Raid Level : raid5
Array Size : 16764928 (15.99 GiB 17.17 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Wed Sep 27 05:19:19 2023
State : clean, degraded, recovering
Active Devices : 2
Working Devices : 4
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : resync
Rebuild Status : 12% complete
Name : debian12:0 (local to host debian12)
UUID : 5fff5a4d:579c17ce:497a40ce:27185fb1
Events : 3
Number Major Minor RaidDevice State
0 254 17 0 active sync /dev/vdb1
1 254 33 1 active sync /dev/vdc1
4 254 49 2 spare rebuilding /dev/vdd1
3 254 65 - spare /dev/vde1
同期が終了した状態
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 vdd1[4] vde1[3](S) vdc1[1] vdb1[0]
16764928 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Wed Sep 27 05:19:06 2023
Raid Level : raid5
Array Size : 16764928 (15.99 GiB 17.17 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Wed Sep 27 05:22:18 2023
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : resync
Name : debian12:0 (local to host debian12)
UUID : 5fff5a4d:579c17ce:497a40ce:27185fb1
Events : 19
Number Major Minor RaidDevice State
0 254 17 0 active sync /dev/vdb1
1 254 33 1 active sync /dev/vdc1
4 254 49 2 active sync /dev/vdd1
3 254 65 - spare /dev/vde1
OS再起動した時にも自動で raid が構成されるように、情報を保存します。
# mdadm --detail --scan
ARRAY /dev/md0 metadata=1.2 name=debian12:0 UUID=5fff5a4d:579c17ce:497a40ce:27185fb1
# mdadm --detail --scan | tee /etc/mdadm.conf
ARRAY /dev/md0 metadata=1.2 name=debian12:0 UUID=5fff5a4d:579c17ce:497a40ce:27185fb1
ディスク交換の練習
交換するディスクに faulty のマークをします。
# mdadm --fail /dev/md0 /dev/vdb1
mdadm: set /dev/vdb1 faulty in /dev/md0
同期が走ります。
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 vdd1[4] vde1[3] vdc1[1] vdb1[0](F)
16764928 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [_UU]
[=>...................] recovery = 8.6% (727944/8382464) finish=2.8min speed=45496K/sec
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Wed Sep 27 05:19:06 2023
Raid Level : raid5
Array Size : 16764928 (15.99 GiB 17.17 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Wed Sep 27 05:23:55 2023
State : clean, degraded, recovering
Active Devices : 2
Working Devices : 3
Failed Devices : 1
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : resync
Rebuild Status : 12% complete
Name : debian12:0 (local to host debian12)
UUID : 5fff5a4d:579c17ce:497a40ce:27185fb1
Events : 23
Number Major Minor RaidDevice State
3 254 65 0 spare rebuilding /dev/vde1
1 254 33 1 active sync /dev/vdc1
4 254 49 2 active sync /dev/vdd1
0 254 17 - faulty /dev/vdb1
同期が終了した状態
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 vdd1[4] vde1[3] vdc1[1] vdb1[0](F)
16764928 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Wed Sep 27 05:19:06 2023
Raid Level : raid5
Array Size : 16764928 (15.99 GiB 17.17 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Wed Sep 27 05:26:45 2023
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : resync
Name : debian12:0 (local to host debian12)
UUID : 5fff5a4d:579c17ce:497a40ce:27185fb1
Events : 38
Number Major Minor RaidDevice State
3 254 65 0 active sync /dev/vde1
1 254 33 1 active sync /dev/vdc1
4 254 49 2 active sync /dev/vdd1
0 254 17 - faulty /dev/vdb1
raid からディスクを除去します。
# mdadm --remove /dev/md0 /dev/vdb1
mdadm: hot removed /dev/vdb1 from /dev/md0
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 vdd1[4] vde1[3] vdc1[1]
16764928 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Wed Sep 27 05:19:06 2023
Raid Level : raid5
Array Size : 16764928 (15.99 GiB 17.17 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Wed Sep 27 05:28:10 2023
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : resync
Name : debian12:0 (local to host debian12)
UUID : 5fff5a4d:579c17ce:497a40ce:27185fb1
Events : 39
Number Major Minor RaidDevice State
3 254 65 0 active sync /dev/vde1
1 254 33 1 active sync /dev/vdc1
4 254 49 2 active sync /dev/vdd1
ホットスペアを追加します。
# mdadm --add /dev/md0 /dev/vdb1
mdadm: added /dev/vdb1
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 vdb1[5](S) vdd1[4] vde1[3] vdc1[1]
16764928 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Wed Sep 27 05:19:06 2023
Raid Level : raid5
Array Size : 16764928 (15.99 GiB 17.17 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Wed Sep 27 05:31:58 2023
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : resync
Name : debian12:0 (local to host debian12)
UUID : 5fff5a4d:579c17ce:497a40ce:27185fb1
Events : 40
Number Major Minor RaidDevice State
3 254 65 0 active sync /dev/vde1
1 254 33 1 active sync /dev/vdc1
4 254 49 2 active sync /dev/vdd1
5 254 17 - spare /dev/vdb1
停止と再開
停止します。
# mdadm --stop /dev/md0
mdadm: stopped /dev/md0
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
unused devices: <none>
再開します。
# mdadm --assemble /dev/md0 /dev/vdb1 /dev/vdc1 /dev/vdd1 /dev/vde1
mdadm: /dev/md0 has been started with 3 drives and 1 spare.
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active (auto-read-only) raid5 vde1[3] vdb1[5](S) vdd1[4] vdc1[1]
16764928 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Wed Sep 27 05:19:06 2023
Raid Level : raid5
Array Size : 16764928 (15.99 GiB 17.17 GB)
Used Dev Size : 8382464 (7.99 GiB 8.58 GB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Wed Sep 27 05:31:58 2023
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : resync
Name : debian12:0 (local to host debian12)
UUID : 5fff5a4d:579c17ce:497a40ce:27185fb1
Events : 40
Number Major Minor RaidDevice State
3 254 65 0 active sync /dev/vde1
1 254 33 1 active sync /dev/vdc1
4 254 49 2 active sync /dev/vdd1
5 254 17 - spare /dev/vdb1
利用終了
停止した後、スーパーブロックをクリアします。
# mdadm --stop /dev/md0
mdadm: stopped /dev/md0
# mdadm --zero-superblock /dev/vdb1 /dev/vdc1 /dev/vdd1 /dev/vde1
# rm /etc/mdadm.conf
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