我有一個 8 驅動器 RAID，我正在嘗試恢復。組裝只找到了 8 個驅動器中的 4 個。為什麼找不到其他驅動器？
我@mjf-svr:~$貓 /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md1 : inactive sdn[7](S) sdk[4](S) sdm[6](S) sdl[5](S) sdi[1](S) sdj[0](S) sdh[2](S) sdg[3](S)
15627068096 blocks super 1.2
md127 : active raid5 sde1[1] sdf1[3] sdd1[0]
1953522688 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
unused devices: <none>
我@mjf-svr:~$須藤 mdadm --stop /dev/md1
[sudo] password for me:
mdadm: stopped /dev/md1
我@mjf-svr:~$sudo mdadm --檢查 /dev/sd[gn]
/dev/sdg:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e2f38846:949163bc:c50d752a:069b9e1d
Name : mjf-svr:1
Creation Time : Sun Feb 22 21:45:59 2015
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
Array Size : 11720297472 (11177.35 GiB 12001.58 GB)
Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1200 sectors
State : active
Device UUID : a32f5f14:7b91eeb6:c5319782:419cdf3f
Update Time : Mon Mar 28 18:47:10 2016
Checksum : 673e7d4e - correct
Events : 6597
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : AAAAAAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdh:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e2f38846:949163bc:c50d752a:069b9e1d
Name : mjf-svr:1
Creation Time : Sun Feb 22 21:45:59 2015
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
Array Size : 11720297472 (11177.35 GiB 12001.58 GB)
Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1200 sectors
State : active
Device UUID : f7f68c18:300fb414:18a46a9a:05c55ecf
Update Time : Mon Mar 28 18:47:10 2016
Checksum : 70845d6d - correct
Events : 6597
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : AAAAAAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdi:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e2f38846:949163bc:c50d752a:069b9e1d
Name : mjf-svr:1
Creation Time : Sun Feb 22 21:45:59 2015
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
Array Size : 11720297472 (11177.35 GiB 12001.58 GB)
Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1200 sectors
State : active
Device UUID : e6f99981:b73578d2:77ad1b95:ee472611
Update Time : Mon Mar 28 18:47:10 2016
Checksum : d3ce132a - correct
Events : 6597
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AAAAAAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdj:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e2f38846:949163bc:c50d752a:069b9e1d
Name : mjf-svr:1
Creation Time : Sun Feb 22 21:45:59 2015
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
Array Size : 11720297472 (11177.35 GiB 12001.58 GB)
Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1200 sectors
State : active
Device UUID : 0a12d1bd:223f4f49:5d60861c:de9f902a
Update Time : Mon Mar 28 18:47:10 2016
Checksum : 27b13f8e - correct
Events : 6597
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAAAAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdk:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e2f38846:949163bc:c50d752a:069b9e1d
Name : mjf-svr:1
Creation Time : Sun Feb 22 21:45:59 2015
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
Array Size : 11720297472 (11177.35 GiB 12001.58 GB)
Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1200 sectors
State : clean
Device UUID : 5e1f443d:d22cf4df:501573f1:0b5d9e68
Update Time : Sun Apr 3 00:57:01 2016
Checksum : 50c49b69 - correct
Events : 6732
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 4
Array State : ....AAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdl:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e2f38846:949163bc:c50d752a:069b9e1d
Name : mjf-svr:1
Creation Time : Sun Feb 22 21:45:59 2015
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
Array Size : 11720297472 (11177.35 GiB 12001.58 GB)
Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1200 sectors
State : clean
Device UUID : afc36449:e71aa993:c9a8c3f6:ee6c37a7
Update Time : Sun Apr 3 00:57:01 2016
Checksum : 5483d12c - correct
Events : 6732
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 5
Array State : ....AAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdm:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e2f38846:949163bc:c50d752a:069b9e1d
Name : mjf-svr:1
Creation Time : Sun Feb 22 21:45:59 2015
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
Array Size : 11720297472 (11177.35 GiB 12001.58 GB)
Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1200 sectors
State : clean
Device UUID : 67bf80fb:dc2cab8b:a743a9f1:8a535392
Update Time : Sun Apr 3 00:57:01 2016
Checksum : e4a36054 - correct
Events : 6732
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 6
Array State : ....AAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdn:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e2f38846:949163bc:c50d752a:069b9e1d
Name : mjf-svr:1
Creation Time : Sun Feb 22 21:45:59 2015
Raid Level : raid6
Raid Devices : 8
Avail Dev Size : 3906767024 (1862.89 GiB 2000.26 GB)
Array Size : 11720297472 (11177.35 GiB 12001.58 GB)
Used Dev Size : 3906765824 (1862.89 GiB 2000.26 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1200 sectors
State : clean
Device UUID : 02c9a435:14df0bca:7d3174de:540f924d
Update Time : Sun Apr 3 00:57:01 2016
Checksum : 531c5c8 - correct
Events : 6732
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 7
Array State : ....AAAA ('A' == active, '.' == missing, 'R' == replacing)
我@mjf-svr:~$sudo mdadm --assemble /dev/md1 /dev/sd[gn]
mdadm: /dev/md1 assembled from 4 drives - not enough to start the array.
我@mjf-svr:~$sudo mdadm --assemble --scan --uuid=e2f38846:949163bc:c50d752a:069b9e1d
mdadm: /dev/md/mjf-svr:1 assembled from 4 drives - not enough to start the array.
我@mjf-svr:~$
答案1
您的四台設備的事件計數為 6732，並認為它們是八設備 RAID-6 陣列的一部分，但缺少四台設備。其他四個的事件計數為 6597，並認為它們是完整的八設備 RAID-6 陣列的一部分。我猜您在 3 月 28 日 18:47:10 遇到了控制器故障或其他問題，導致一半的驅動器離線。
我希望你有備份。您可以嘗試恢復失敗的軟體 RAID來自 Linux RAID wiki 的過程（關鍵步驟是使用 組裝陣列--force；該過程其餘部分的目的是提前弄清楚這是否會保存或破壞數據），但事件中存在顯著差異算了，我沒想到它會成功。