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Server has a software RAID 1 (sda+sdb) configured as /dev/md0 device.

Later system upgrade was launched and grub updated. Now it promped to select grub unstall devices from the list to finish update: - /dev/sda - /dev/sdb - /dev/md0

What items should be selected in case of RAID 1?

Update. fdisk tells:

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1           59343       60801    11719417+  fd  Linux raid autodetect
/dev/sda2   *           1       59342   476664583+  fd  Linux raid autodetect

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1           59343       60801    11719417+  fd  Linux raid autodetect
/dev/sdb2   *           1       59342   476664583+  fd  Linux raid autodetect
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You should install GRUB to both /dev/sda and /dev/sdb, so that both devices are bootable. You want this so that the system will still boot if the first drive which the BIOS boots off fails.

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You should install it on /dev/md0, so mirroring can occur.

  • This won't install to the MBR, which is most likely needed. – mgorven Jul 30 '12 at 0:07

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