How to Set up GRUB to boot from both disks of mirrored RAID
On Linux software RAID 1, GRUB normally boots from the primary disk. Configure it on the secondary disk too so the system can boot if the primary fails.
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3 articles on this topic
Regenerate a GRUB device.map file
device.map maps hard disk devices to GRUB device names and is created during operating system installation. Recreate it if it is missing.
How to Remove LILO, GRUB or Master Boot Record from system
A hard disk generally stores the system bootloader's binary code in the first 512 sectors, or 512 bytes. LILO or GRUB embeds itself in the master boot record…