Grub cannot see Arch on a seperate hard drive [Solved]

[Foxblood]

Hi, all,


I re-installed Sabayon on to my main hard drive. I also have Arch installed on another hard drive. Grub can see Sabayon and Win 7 on the main hard drive but fails to detect Arch on the other. grub-mkconfig -o /boot/grub/grub.cfg doesn't help.
fdisk -l gives me this:

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x357fae20

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 982439009 491218481 7 HPFS/NTFS/exFAT
/dev/sda2 982439936 983463935 512000 83 Linux
/dev/sda3 983463936 1953523711 485029888 8e Linux LVM

Disk /dev/sdb: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xf16d6536

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 80324 40162 83 Linux
/dev/sdb2 80325 1140614 530145 82 Linux swap / Solaris
/dev/sdb3 1140615 16514819 7687102+ 83 Linux
/dev/sdb4 16514820 625137344 304311262+ 83 Linux

Disk /dev/mapper/vg_athena-lv_root: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders, total 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/vg_athena-lv_root doesn't contain a valid partition table

Disk /dev/mapper/vg_athena-lv_home: 434.5 GB, 434529894400 bytes
255 heads, 63 sectors/track, 52828 cylinders, total 848691200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/vg_athena-lv_home doesn't contain a valid partition table

Disk /dev/mapper/vg_athena-lv_swap: 8422 MB, 8422162432 bytes
255 heads, 63 sectors/track, 1023 cylinders, total 16449536 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/vg_athena-lv_swap doesn't contain a valid partition table

How can I get Grub to detect Arch?

[genfool]

which distro controls grub?
If it is sabayon, need to boot sabayon mount the arch partition before running grub-mkconfig

You would probably need to mkdir /mnt/arch or whatever you want to call it.
Edit fstab and add arch to it, then mount the partition or reboot to see if it mounts automatically from your work in fstab.

Code: Select all

grub-mkconfig -o /boot/grub/grub.cfg

should now find arch and add it to grub boot menu

[raman]

If not, add manually.

[Foxblood]

Thanks, very much for the assistance, much appreciated.