我试图将 raid 5 升级到更大的驱动器。我遵循了在以下网址找到的指南：
https://rabexc.org/posts/mdadm-replace
但在添加更大的驱动器之前，我就能感觉到有些不对劲。两个设备似乎消失了。所以我尝试重新添加原始驱动器。看起来 mdamd 可以看到所有 4 个，但我不确定哪里出了问题。我原来的 4 个驱动器都重新连接了，Ubuntu 可以看到它们。我如何让原始设置再次运行？
我正在运行 Ubuntu 20
4 个驱动器是 4TB SATA 物理磁盘
我认为这个输出可能是最有帮助的：
sudo mdadm --examine /dev/sd[a-z]1
/dev/sda1:
MBR Magic : aa55
/dev/sdb1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : e73fc900:63b29dac:59abec6d:a9ed6e02
Name : ubuntu1:0 (local to host ubuntu1)
Creation Time : Mon Feb 1 14:28:44 2021
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 7813770895 (3725.90 GiB 4000.65 GB)
Array Size : 11720655360 (11177.69 GiB 12001.95 GB)
Used Dev Size : 7813770240 (3725.90 GiB 4000.65 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=655 sectors
State : clean
Device UUID : fc1484e3:9dd42927:050c3334:510f959c
Internal Bitmap : 8 sectors from superblock
Update Time : Mon Jul 3 22:53:17 2023
Bad Block Log : 512 entries available at offset 24 sectors
Checksum : e373a9f0 - correct
Events : 29259
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : A..A ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdc1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : e73fc900:63b29dac:59abec6d:a9ed6e02
Name : ubuntu1:0 (local to host ubuntu1)
Creation Time : Mon Feb 1 14:28:44 2021
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 7813770895 (3725.90 GiB 4000.65 GB)
Array Size : 11720655360 (11177.69 GiB 12001.95 GB)
Used Dev Size : 7813770240 (3725.90 GiB 4000.65 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=655 sectors
State : clean
Device UUID : ef83a829:fb3b15d5:a8efbc06:6e1ce6ff
Internal Bitmap : 8 sectors from superblock
Update Time : Mon Jul 3 22:48:11 2023
Bad Block Log : 512 entries available at offset 24 sectors
Checksum : d606fcd - correct
Events : 29256
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AA.A ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdd1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : e73fc900:63b29dac:59abec6d:a9ed6e02
Name : ubuntu1:0 (local to host ubuntu1)
Creation Time : Mon Feb 1 14:28:44 2021
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 7813770895 (3725.90 GiB 4000.65 GB)
Array Size : 11720655360 (11177.69 GiB 12001.95 GB)
Used Dev Size : 7813770240 (3725.90 GiB 4000.65 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=655 sectors
State : clean
Device UUID : 33674b45:e1670e28:6357bac7:54feeea5
Internal Bitmap : 8 sectors from superblock
Update Time : Mon Jul 3 22:45:08 2023
Bad Block Log : 512 entries available at offset 24 sectors
Checksum : e301c7e1 - correct
Events : 29253
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sde1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : e73fc900:63b29dac:59abec6d:a9ed6e02
Name : ubuntu1:0 (local to host ubuntu1)
Creation Time : Mon Feb 1 14:28:44 2021
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 7813770895 (3725.90 GiB 4000.65 GB)
Array Size : 11720655360 (11177.69 GiB 12001.95 GB)
Used Dev Size : 7813770240 (3725.90 GiB 4000.65 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=655 sectors
State : clean
Device UUID : effdc94e:e1c09065:676782d9:11099abc
Internal Bitmap : 8 sectors from superblock
Update Time : Mon Jul 3 22:53:17 2023
Bad Block Log : 512 entries available at offset 24 sectors
Checksum : 5274d44e - correct
Events : 29259
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : A..A ('A' == active, '.' == missing, 'R' == replacing)
更新：
看起来我的驱动器不同步了？
/dev/sdb1:
Events : 29259
Device Role : Active device 0
/dev/sdc1:
Events : 29256
Device Role : Active device 1
/dev/sdd1:
Events : 29253
Device Role : Active device 2
/dev/sde1:
Events : 29259
Device Role : Active device 3
答案1
我发现下面的命令修复了同步问题。我基本理解了它，但也不知道我对此有什么不了解。
我学到的一点是，我不需要按照任何特定的顺序排列 /dev/sdx1 驱动器。作为 Linux 上的软件 RAID，它会从驱动器中读取识别信息，并使用该信息进行组装。我只是传递要考虑哪些设备。
mdadm --assemble --run --force --update=resync /dev/md127 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1