RAID 故障後如何啟動（軟體 RAID）？

以前，我使用 ( mdadm) 的驅動器sda和sdb. sdb失敗，重新啟動系統的唯一方法是拔下第二個硬碟驅動器。

現在我添加了新的sdb和sdc我的 RAID 設置。sda是最舊的（因此最有可能失敗），它是我們啟動的驅動器（我想，我該如何檢查？）。

我如何確保和測試（通過 GRUB 配置等）如果sda失敗，我仍然能夠引導我的機器。

fdisk -l:

Disk /dev/sda: 250.0 GB, 250000000000 bytes
255 heads, 63 sectors/track, 30394 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000080

  Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1       30064   241489048+  fd  Linux raid autodetect
/dev/sda2           30065       30394     2650725    5  Extended
/dev/sda5           30065       30394     2650693+  fd  Linux raid autodetect

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

  Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1       30064   241489048+  fd  Linux raid autodetect
Partition 1 does not start on physical sector boundary.
/dev/sdb2           30065       30394     2650725    5  Extended
/dev/sdb5           30065       30394     2650693+  fd  Linux raid autodetect
Partition 5 does not start on physical sector boundary.

Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

  Device Boot      Start         End      Blocks   Id  System
/dev/sdc1   *           1       30064   241489048+  fd  Linux raid autodetect
Partition 1 does not start on physical sector boundary.
/dev/sdc2           30065       30394     2650725    5  Extended
/dev/sdc5           30065       30394     2650693+  fd  Linux raid autodetect
Partition 5 does not start on physical sector boundary.

Disk /dev/md0: 247.3 GB, 247284695040 bytes
2 heads, 4 sectors/track, 60372240 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Alignment offset: 512 bytes
Disk identifier: 0x00000000

Disk /dev/md0 doesn't contain a valid partition table

Disk /dev/md1: 2714 MB, 2714238976 bytes
2 heads, 4 sectors/track, 662656 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Alignment offset: 512 bytes
Disk identifier: 0x00000000

Disk /dev/md1 doesn't contain a valid partition table

你不能。在這種情況下，只有拔掉 sda 會有所幫助。在那種情況下，sdb 將是 sda…（braindead Linux 設備編號 - Solaris 和 HP-Unix 使用 SCSI-ID。）

因此，對於引導載入程序，您應該將其安裝在 sda 上，然後將其複製dd到 sdb 和 sdc。

引用自：https://unix.stackexchange.com/questions/83787