I have a server running Debian 11 with 3 HDDs, each 500gb using software RAID1.
I'm now in the process of upgrading so I have 2x1TB drives. To accomplish this I followed this guide.
The disk I removed first was /dev/sda. Now when I have 2 disks left in the server it cannot boot. BIOS says it cannot find a system disk with OS.
I managed to do research and my guess is that the bootloader is not available on my other 2 disks (/dev/sdb /dev/sdc). Using SuperGrub2Disk I can boot to my system! I figured all I had to do was grub-install /dev/sda which is now my first disk. However it did not solve anything, I'm still unable to boot without SuperGrub2Disk.
I need help with guiding me in the right direction of what else to check, or if I tried installing grub to my disk incorrectly somehow.
Extremely grateful for any help! I'm still a amateur debian user.
What info from the terminal would you like to have?
Result of fdisk -l:
Disk /dev/sda: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: SAMSUNG HD502HJ
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xe9299246
Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 976771071 976769024 465.8G fd Linux raid autodetect
Disk /dev/sdb: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: TOSHIBA DT01ACA0
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x61294bfb
Device Boot Start End Sectors Size Id Type
/dev/sdb1 * 2048 976771071 976769024 465.8G fd Linux raid autodetect
Disk /dev/sdc: 28.65 GiB, 30765219840 bytes, 60088320 sectors
Disk model: Cruzer Blade
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0a885191
Device Boot Start End Sectors Size Id Type
/dev/sdc1 * 2048 60088319 60086272 28.7G c W95 FAT32 (LBA)
Disk /dev/md0: 465.63 GiB, 499970473984 bytes, 976504832 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xa127a3b1
Device Boot Start End Sectors Size Id Type
/dev/md0p1 * 2 974503919 974503918 464.7G 83 Linux
/dev/md0p2 974503920 976504649 2000730 976.9M 5 Extended
/dev/md0p5 974503922 976504649 2000728 976.9M 82 Linux swap / Solaris
Partition 1 does not start on physical sector boundary.
Partition 5 does not start on physical sector boundary.
