我使用的是 Debian 10，一周前全新安装。我从以前的服务器上移走了我的阵列，一切都很顺利。
然后我在阵列中添加了一个新驱动器并进行了增长。
mdadm --add /dev/md1 /dev/sda2
mdadm --grow /dev/md1 --raid-devices=5
但遗憾的是我忘记了重塑正在进行中，我彻底关闭了服务器。
重新启动时，突袭显示为“状态：干净”，但它没有恢复重塑。如果重塑完成，阵列大小显然应为 8000GB (2TB x4)，而不是 6000GB。 “Delta Devices”这一行也仍然显示。所以有些事情很奇怪。
# mdadm --detail /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Wed Feb 1 20:36:04 2017
Raid Level : raid5
Array Size : 5860113408 (5588.64 GiB 6000.76 GB)
Used Dev Size : 1953371136 (1862.88 GiB 2000.25 GB)
Raid Devices : 5
Total Devices : 5
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Sat Jan 9 02:28:28 2021
State : clean
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : bitmap
Delta Devices : 1, (4->5)
Name : Debbie-NAS:1 (local to host Debbie-NAS)
UUID : d1915c3c:c727e641:060346f9:a4f590ac
Events : 18828
Number Major Minor RaidDevice State
0 8 130 0 active sync /dev/sdi2
1 8 146 1 active sync /dev/sdj2
3 8 98 2 active sync /dev/sdg2
4 8 114 3 active sync /dev/sdh2
5 8 2 4 active sync /dev/sda2
我尝试手动恢复重塑，但它什么也没做：
# mdadm --grow --continue /dev/md1 --raid-devices=5
mdadm --examine 的输出：
# mdadm --examine /dev/sd[ijgha]2
/dev/sda2:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x45
Array UUID : d1915c3c:c727e641:060346f9:a4f590ac
Name : Debbie-NAS:1 (local to host Debbie-NAS)
Creation Time : Wed Feb 1 20:36:04 2017
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 3906745344 (1862.88 GiB 2000.25 GB)
Array Size : 7813484544 (7451.52 GiB 8001.01 GB)
Used Dev Size : 3906742272 (1862.88 GiB 2000.25 GB)
Data Offset : 259072 sectors
New Offset : 254976 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 43eed232:f3d1d806:02e8bb5c:e1c90318
Internal Bitmap : 8 sectors from superblock
Reshape pos'n : 2651604992 (2528.77 GiB 2715.24 GB)
Delta Devices : 1 (4->5)
Update Time : Sat Jan 9 02:28:28 2021
Bad Block Log : 512 entries available at offset 16 sectors
Checksum : 23eaf33b - correct
Events : 18828
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 4
Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdg2:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x45
Array UUID : d1915c3c:c727e641:060346f9:a4f590ac
Name : Debbie-NAS:1 (local to host Debbie-NAS)
Creation Time : Wed Feb 1 20:36:04 2017
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 3906745344 (1862.88 GiB 2000.25 GB)
Array Size : 7813484544 (7451.52 GiB 8001.01 GB)
Used Dev Size : 3906742272 (1862.88 GiB 2000.25 GB)
Data Offset : 259072 sectors
New Offset : 254976 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 2d31b7f3:57b1d12f:ba0d9e73:3cb36b33
Internal Bitmap : 8 sectors from superblock
Reshape pos'n : 2651604992 (2528.77 GiB 2715.24 GB)
Delta Devices : 1 (4->5)
Update Time : Sat Jan 9 02:28:28 2021
Bad Block Log : 512 entries available at offset 72 sectors
Checksum : 401224d3 - correct
Events : 18828
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdh2:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x45
Array UUID : d1915c3c:c727e641:060346f9:a4f590ac
Name : Debbie-NAS:1 (local to host Debbie-NAS)
Creation Time : Wed Feb 1 20:36:04 2017
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 3906745344 (1862.88 GiB 2000.25 GB)
Array Size : 7813484544 (7451.52 GiB 8001.01 GB)
Used Dev Size : 3906742272 (1862.88 GiB 2000.25 GB)
Data Offset : 259072 sectors
New Offset : 254976 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 017bea40:0a6ce8e3:f4a5639e:97a33826
Internal Bitmap : 8 sectors from superblock
Reshape pos'n : 2651604992 (2528.77 GiB 2715.24 GB)
Delta Devices : 1 (4->5)
Update Time : Sat Jan 9 02:28:28 2021
Bad Block Log : 512 entries available at offset 72 sectors
Checksum : 5eeeb1f0 - correct
Events : 18828
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdi2:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x45
Array UUID : d1915c3c:c727e641:060346f9:a4f590ac
Name : Debbie-NAS:1 (local to host Debbie-NAS)
Creation Time : Wed Feb 1 20:36:04 2017
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 3906745344 (1862.88 GiB 2000.25 GB)
Array Size : 7813484544 (7451.52 GiB 8001.01 GB)
Used Dev Size : 3906742272 (1862.88 GiB 2000.25 GB)
Data Offset : 259072 sectors
New Offset : 254976 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 31b13e8c:ede4a229:8da4c45c:d7c1814d
Internal Bitmap : 8 sectors from superblock
Reshape pos'n : 2651604992 (2528.77 GiB 2715.24 GB)
Delta Devices : 1 (4->5)
Update Time : Sat Jan 9 02:28:28 2021
Bad Block Log : 512 entries available at offset 72 sectors
Checksum : d5a77dd7 - correct
Events : 18828
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdj2:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x45
Array UUID : d1915c3c:c727e641:060346f9:a4f590ac
Name : Debbie-NAS:1 (local to host Debbie-NAS)
Creation Time : Wed Feb 1 20:36:04 2017
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 3906745344 (1862.88 GiB 2000.25 GB)
Array Size : 7813484544 (7451.52 GiB 8001.01 GB)
Used Dev Size : 3906742272 (1862.88 GiB 2000.25 GB)
Data Offset : 259072 sectors
New Offset : 254976 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 3d5bc161:4f1b1a23:e16f3630:57fcee88
Internal Bitmap : 8 sectors from superblock
Reshape pos'n : 2651604992 (2528.77 GiB 2715.24 GB)
Delta Devices : 1 (4->5)
Update Time : Sat Jan 9 02:28:28 2021
Bad Block Log : 512 entries available at offset 72 sectors
Checksum : b380641a - correct
Events : 18828
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing)
但由于某种原因，该数组似乎是只读的，也许它阻止了重塑？
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md1 : active (auto-read-only) raid5 sdi2[0] sdh2[4] sdj2[1] sdg2[3] sda2[5]
5860113408 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/5] [UUUUU]
bitmap: 0/15 pages [0KB], 65536KB chunk
底层文件系统已正确安装，我可以访问我的数据。
但一定是某个地方出了问题，因为数组没有达到应有的大小，而且重塑也没有完成。但我不知道如何解决它。
也许我可以尝试开始“检查”？
echo 'check' > /sys/block/md1/md/sync_action
但我担心如果重塑不完整，它可能会破坏某些东西。
任何想法 ？
答案1
最后，我执行了以下命令来开始重新整形：
mdadm --readwrite /dev/md1
cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md1 : active raid5 sdi2[0] sdh2[4] sdj2[1] sdg2[3] sda2[5]
5860113408 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/5] [UUUUU]
[======>..............] reshape = 33.9% (662920160/1953371136) finish=6817.6min speed=3152K/sec
bitmap: 0/15 pages [0KB], 65536KB chunk
所以看起来一切都很好。这次我会在关闭服务器之前让重塑完成