发生了一些未知的硬件问题，看起来似乎导致所有 4 个硬盘驱动器脱机。扭动一些电线和硬盘又回来了（？？？）。现在遇到了袭击问题。
突袭不会开始
“/dev/md/1 由 3 个驱动器组装而成 - 不足以在不干净的情况下启动阵列”
但令人不安的是，当它是 raid 6 时，它似乎将其视为 raid 1。 4 个驱动器的 raid 6 阵列应该可以使用一个。
关于在保留数据的同时尝试再次进行此操作有什么建议吗？首先有任何非破坏性的选择吗？在我弄清楚为什么它似乎相信它的突袭1之前，我犹豫是否要强制执行。
mdadm --examine /dev/sd[dcba]3 | egrep 'Event|/dev'
/dev/sda3:
Events : 395
/dev/sdb3:
Events : 318
/dev/sdc3:
Events : 396
/dev/sdd3:
Events : 396
So not that out of sync right?
mdadm --assemble --scan -o -u 69d7ed4a:8bbcae7b:7fddfd36:6f1fcf16 -v
mdadm: /dev/sdd3 is identified as a member of /dev/md/1, slot 1.
mdadm: /dev/sdc3 is identified as a member of /dev/md/1, slot 2.
mdadm: /dev/sdb3 is identified as a member of /dev/md/1, slot 3.
mdadm: /dev/sda3 is identified as a member of /dev/md/1, slot 0.
mdadm: added /dev/sda3 to /dev/md/1 as 0
mdadm: added /dev/sdc3 to /dev/md/1 as 2
mdadm: added /dev/sdb3 to /dev/md/1 as 3 (possibly out of date)
mdadm: added /dev/sdd3 to /dev/md/1 as 1
mdadm: /dev/md/1 assembled from 3 drives - not enough to start the array while not clean - consider --force.
检查驱动器显示 raid6，并且 sdb3 是唯一不显示丢失驱动器的驱动器。
mdadm --examine /dev/sd[dcba]3
/dev/sda3:
Magic : a92b4efc
Version : 1.0
Feature Map : 0x0
Array UUID : 69d7ed4a:8bbcae7b:7fddfd36:6f1fcf16
Name : 1
Creation Time : Sat Nov 24 17:11:48 2018
Raid Level : raid6
Raid Devices : 4
Avail Dev Size : 15624915112 sectors (7.28 TiB 8.00 TB)
Array Size : 15624915072 KiB (14.55 TiB 16.00 TB)
Used Dev Size : 15624915072 sectors (7.28 TiB 8.00 TB)
Super Offset : 15624915368 sectors
Unused Space : before=0 sectors, after=296 sectors
State : clean
Device UUID : 53fb577d:03e1050b:3ab8b5b3:d5574384
Update Time : Fri Jun 19 05:45:13 2020
Checksum : 22c600bb - correct
Events : 395
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 0
Array State : AAA. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdb3:
Magic : a92b4efc
Version : 1.0
Feature Map : 0x0
Array UUID : 69d7ed4a:8bbcae7b:7fddfd36:6f1fcf16
Name : 1
Creation Time : Sat Nov 24 17:11:48 2018
Raid Level : raid6
Raid Devices : 4
Avail Dev Size : 15624915112 sectors (7.28 TiB 8.00 TB)
Array Size : 15624915072 KiB (14.55 TiB 16.00 TB)
Used Dev Size : 15624915072 sectors (7.28 TiB 8.00 TB)
Super Offset : 15624915368 sectors
Unused Space : before=0 sectors, after=296 sectors
State : clean
Device UUID : ac920534:e5bc15e4:b2472221:ce16aa24
Update Time : Fri Jun 19 05:32:52 2020
Checksum : c05abf36 - correct
Events : 318
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 3
Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdc3:
Magic : a92b4efc
Version : 1.0
Feature Map : 0x0
Array UUID : 69d7ed4a:8bbcae7b:7fddfd36:6f1fcf16
Name : 1
Creation Time : Sat Nov 24 17:11:48 2018
Raid Level : raid6
Raid Devices : 4
Avail Dev Size : 15624915112 sectors (7.28 TiB 8.00 TB)
Array Size : 15624915072 KiB (14.55 TiB 16.00 TB)
Used Dev Size : 15624915072 sectors (7.28 TiB 8.00 TB)
Super Offset : 15624915368 sectors
Unused Space : before=0 sectors, after=296 sectors
State : active
Device UUID : 665a7028:041ce9d4:45396f7e:e9f45574
Update Time : Fri Jun 19 05:45:18 2020
Checksum : 528db8f6 - correct
Events : 396
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 2
Array State : AAA. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdd3:
Magic : a92b4efc
Version : 1.0
Feature Map : 0x0
Array UUID : 69d7ed4a:8bbcae7b:7fddfd36:6f1fcf16
Name : 1
Creation Time : Sat Nov 24 17:11:48 2018
Raid Level : raid6
Raid Devices : 4
Avail Dev Size : 15624915112 sectors (7.28 TiB 8.00 TB)
Array Size : 15624915072 KiB (14.55 TiB 16.00 TB)
Used Dev Size : 15624915072 sectors (7.28 TiB 8.00 TB)
Super Offset : 15624915368 sectors
Unused Space : before=0 sectors, after=296 sectors
State : active
Device UUID : 9b1ebb07:6cf51bf4:b6a52bd7:e7beedf9
Update Time : Fri Jun 19 05:45:18 2020
Checksum : 2f5f8d02 - correct
Events : 396
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 1
Array State : AAA. ('A' == active, '.' == missing, 'R' == replacing)
使用 smartctl 检查了所有驱动器，没有发现任何问题。
答案1
我没有看到任何证据表明 mdadm 正在尝试使用 RAID 1。
我所看到的是 mdadm 尝试启动 RAID 6，发现一个磁盘已过期，两个磁盘丢失，并且相当合理地拒绝组装它。
如果您有一个过时的磁盘并且它是 RAID 6，您可能无法依赖此集合中的任何内容。如果您有备份，是时候从备份中恢复了。