我刚刚将 Fedora 22 全新安装到具有现有 RAID-5 阵列的系统上。五驱。内核在一夜之间报告了设备错误，3 TB XFS 文件系统被卸载，现在重新启动后阵列将无法组装。
这是尝试组装数组的结果：
mdadm --assemble /dev/md0 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1
mdadm: /dev/md0 assembled from 2 drives and 1 spare - not enough to start the array.
以下是 5 个分区中每个分区的“mdadm --examine”的输出。我不足以理解事件计数器和“数组状态”之间的差异（所有设备上的情况都不相同）。
我知道不要使用“--create”，但我犹豫是否要在没有人监视的情况下尝试“--force”。
这个数组丢失了吗？如果不可能，我应该采取什么步骤？
/dev/sdc1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 65f056dc:780db9b5:023c0144:77f12f74
Name : odin.hudaceks.home:1 (local to host odin.hudaceks.home)
Creation Time : Thu Sep 18 16:30:47 2014
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 1953101824 (931.31 GiB 999.99 GB)
Array Size : 2929651200 (2793.93 GiB 2999.96 GB)
Used Dev Size : 1953100800 (931.31 GiB 999.99 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1024 sectors
State : clean
Device UUID : 3f08354b:c076cddc:99b85968:a8928ea8
Update Time : Sun Aug 2 22:25:33 2015
Checksum : 9db3229f - correct
Events : 6078
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AA.. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdd1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 65f056dc:780db9b5:023c0144:77f12f74
Name : odin.hudaceks.home:1 (local to host odin.hudaceks.home)
Creation Time : Thu Sep 18 16:30:47 2014
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 1953101824 (931.31 GiB 999.99 GB)
Array Size : 2929651200 (2793.93 GiB 2999.96 GB)
Used Dev Size : 1953100800 (931.31 GiB 999.99 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1024 sectors
State : clean
Device UUID : addd6f2b:fb4c33a6:2a8b152e:e716eba7
Update Time : Sun Aug 2 22:25:33 2015
Checksum : c6c2519 - correct
Events : 6078
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AA.. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sde1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 65f056dc:780db9b5:023c0144:77f12f74
Name : odin.hudaceks.home:1 (local to host odin.hudaceks.home)
Creation Time : Thu Sep 18 16:30:47 2014
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 1953101824 (931.31 GiB 999.99 GB)
Array Size : 2929651200 (2793.93 GiB 2999.96 GB)
Used Dev Size : 1953100800 (931.31 GiB 999.99 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1024 sectors
State : clean
Device UUID : d92883c5:0e3ded13:75b11223:f0570e0a
Update Time : Sun Aug 2 22:21:47 2015
Checksum : 6b57c6ce - correct
Events : 6073
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdf1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 65f056dc:780db9b5:023c0144:77f12f74
Name : odin.hudaceks.home:1 (local to host odin.hudaceks.home)
Creation Time : Thu Sep 18 16:30:47 2014
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 1953101824 (931.31 GiB 999.99 GB)
Array Size : 2929651200 (2793.93 GiB 2999.96 GB)
Used Dev Size : 1953100800 (931.31 GiB 999.99 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1024 sectors
State : active
Device UUID : 42eeb231:ccb57477:357d0c47:d99b159d
Update Time : Sun Aug 2 22:21:51 2015
Checksum : f21014a5 - correct
Events : 6074
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdg1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 65f056dc:780db9b5:023c0144:77f12f74
Name : odin.hudaceks.home:1 (local to host odin.hudaceks.home)
Creation Time : Thu Sep 18 16:30:47 2014
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 1953101824 (931.31 GiB 999.99 GB)
Array Size : 2929651200 (2793.93 GiB 2999.96 GB)
Used Dev Size : 1953100800 (931.31 GiB 999.99 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=1024 sectors
State : clean
Device UUID : 93469bf1:9f571d4b:dab66eb4:08c45766
Update Time : Sun Aug 2 22:25:33 2015
Checksum : bc477178 - correct
Events : 6078
Layout : left-symmetric
Chunk Size : 512K
Device Role : spare
Array State : AA.. ('A' == active, '.' == missing, 'R' == replacing)
编辑 1：添加有关控制器的信息。
04:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9123 PCIe SATA 6.0 Gb/s controller (rev 11) (prog-if 01 [AHCI 1.0])
Subsystem: Marvell Technology Group Ltd. 88SE9123 PCIe SATA 6.0 Gb/s controller
Flags: bus master, fast devsel, latency 0, IRQ 30
I/O ports at d040 [size=8]
I/O ports at d030 [size=4]
I/O ports at d020 [size=8]
I/O ports at d010 [size=4]
I/O ports at d000 [size=16]
Memory at fe510000 (32-bit, non-prefetchable) [size=2K]
Expansion ROM at fe500000 [disabled] [size=64K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [70] Express Legacy Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Kernel driver in use: ahci
答案1
你有一个备用的/dev/sdg1，对吗？如果它只是备用，则它不应该包含任何数据，因此对您的恢复工作毫无用处。
/dev/sde1失败了，不久之后也失败了/dev/sdf1，最大的问题是，为什么？这些磁盘真的坏了吗？您检查过 SMART 并运行自检吗？或者是您已经修复的控制器/电缆/电源问题？
如果你想安全一点，可以使用这个方法：
然后assemble --force使用dev/sdc1 /dev/sdd1 /dev/sdf1. （两个完好的磁盘加上最后一个发生故障的磁盘）。如果它运行，并且 RAID 上的文件系统在发生故障时正在使用，它将看起来像断电后并且可能需要fsck（更有理由在写时复制层上执行此操作，因此您可以如果出现问题则撤消）。