参考：https://www.taterli.com/8394/
cat /proc/mdstatPersonalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5]
[raid4] [raid10] md1 : active raid1 sda3[0] sdb3[1]
998933504 blocks super 1.2 [2/2] [UU]
[===========>.........] resync = 58.6% (585393536/998933504) finish=34.4m in speed=200051K/sec
bitmap: 5/8 pages [20KB], 65536KB chunk
md0 : active raid1 sda2[0] sdb2[1]
613376 blocks super 1.2 [2/2] [UU]
unused devices: <none>
mdadm /dev/md1 --fail /dev/sda3mdadm: set /dev/sda3 faulty in /dev/md1
mdadm /dev/md1 --remove /dev/sda3mdadm: hot removed /dev/sda3 from /dev/md1
wipefs -a /dev/sda3/dev/sda3: 4 bytes were erased at offset 0x00001000(linux_raid_member): fc 4e 2b a9
cat /proc/mdstatPersonalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5]
[raid4] [raid10] md1 : active raid1 sdb3[1]
998933504 blocks super 1.2 [2/1] [_U]
bitmap: 6/8 pages [24KB], 65536KB chunk
md0 : active raid1 sda2[0] sdb2[1]
613376 blocks super 1.2 [2/2] [UU]
unused devices: <none>
mdadm --detail /dev/md1/dev/md1:
Version : 1.2
Creation Time : Sat Aug 13 14:05:32 2022
Raid Level : raid1
Array Size : 998933504 (952.66 GiB 1022.91 GB)
Used Dev Size : 998933504 (952.66 GiB 1022.91 GB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Sat Aug 13 15:02:06 2022
State : clean, degraded
Active Devices : 1 Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Consistency Policy : bitmap
Name : debian:1
UUID : 81cd0062:214021da:f76ccc0a:829afc8e
Events : 1436
Number Major Minor RaidDevice State
- 0 0 0 removed
1 8 19 1 active sync /dev/sdb3
mdadm --grow /dev/md1 --level=0mdadm: level of /dev/md1 changed to raid0
mdadm --misc --detail /dev/md1/dev/md1:
Version : 1.2
Creation Time : Sat Aug 13 14:05:32 2022
Raid Level : raid0
Array Size : 998933504 (952.66 GiB 1022.91 GB)
Raid Devices : 1
Total Devices : 1
Persistence : Superblock is persistent
Update Time : Sat Aug 13 15:03:23 2022
State : clean
Active Devices : 1 Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Chunk Size : 64K
Consistency Policy : none
Name : debian:1
UUID : 81cd0062:214021da:f76ccc0a:829afc8e
Events : 1442
Number Major Minor RaidDevice State
1 8 19 0 active sync /dev/sdb3
mdadm --add /dev/md1 /dev/sda3ps.如果遇到禁止添加,可以尝试使用:mdadm /dev/md1 --grow -l 0 --raid-devices=2 -a /dev/sda3
mdadm: level of /dev/md1 changed to raid4
mdadm: added /dev/sda3
mdadm --misc --detail /dev/md1/dev/md1:
Version : 1.2
Creation Time : Sat Aug 13 14:05:32 2022
Raid Level : raid4
Array Size : 998933504 (952.66 GiB 1022.91 GB)
Used Dev Size : 998933504 (952.66 GiB 1022.91 GB)
Raid Devices : 3
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Sat Aug 13 15:07:32 2022
State : active, FAILED, reshaping
Active Devices : 1 Working Devices : 2
Failed Devices : 0
Spare Devices : 1
Chunk Size : 64K
Consistency Policy : resync
Reshape Status : 0% complete
Delta Devices : 1, (2->3)
Name : debian:1
UUID : 81cd0062:214021da:f76ccc0a:829afc8e
Events : 1488
Number Major Minor RaidDevice State
1 8 19 0 active sync /dev/sdb3
2 8 3 1 spare rebuilding /dev/sda3
- 0 0 2 removed
watch cat /proc/mdstatEvery 2.0s: cat /proc/mdstat
op1: Sat Aug 13 15:08:46 2022
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5]
[raid4] [raid10] md1 : active raid4 sda3[2] sdb3[1]
998933504 blocks super 1.2 level 4, 64k chunk, algorithm 5 [3/2] [U__]
[>....................] reshape = 1.1% (11306924/998933504) finish=201.1min speed=81843K/sec
md0 : active raid1 sda2[0] sdb2[1]
613376 blocks super 1.2 [2/2] [UU]
unused devices: <none>
正在努力Reshape,然后漫长时间后重启,就Raid0了.
mdadm --misc --detail /dev/md1
resize2fs /dev/md1
df -h