Servers:Musashi
GRUB sometimes screws up :-(
Drive mapping:
swap = /dev/hda9 / = /dev/hda5 /boot = /dev/hda1 /usr = /dev/hda6 /var = /dev/hda7
Software-RAID (RAID-1, mirror) mappings:
/boot = /dev/md/0 (ext2) / = /dev/md/1 (ext3) /usr/ = /dev/md/2 (ext3) /var/ = /dev/md/3 (ext3) /tmp = /dev/md/4 (ext3) swap = /dev/md/5 (swap)
Software-RAID constituents:
musashi proc # cat mdstat
Personalities : [raid1]
md0 : active raid1 hdc1[1] hda1[0]
64192 blocks [2/2] [UU]
md2 : active raid1 hdc6[1] hda6[0]
10000320 blocks [2/2] [UU]
md3 : active raid1 hdc7[1] hda7[0]
10000320 blocks [2/2] [UU]
md4 : active raid1 hdc8[1] hda8[0]
10000320 blocks [2/2] [UU]
md5 : active raid1 hdc9[1] hda9[0]
995904 blocks [2/2] [UU]
md1 : active raid1 hdc5[1] hda5[0]
8056448 blocks [2/2] [UU]
unused devices: <none>
Hardware-RAID (Arena EX3) mappings:
/mnt/raid3 = /dev/sdb1 (xfs) /mnt/raid4 = /dev/sdc1 (xfs) /mnt/holding = /dev/sda1 (xfs) /export/mirror = /mnt/raid4/mirror
grub grub> root (hd0,0) grub> setup (hd0) grub> root (hd1,0) grub> setup (hd1) grub> quit
To verify GRUB installation:
grub grub> find /boot/grub/stage1 (hd0,0) (hd1,0) grub>
Note well - in /boot/grub/grub.conf we point to the software-RAID root, not each individual drive
real_root=/dev/md1
Machine info
dual Xeon 2.6GHz, 1GB, SCSI-attached 1TB RAID,
SCSI-attached 100GB tape-drive, 3 x GigE, software OS-RAID,
36GB SCSI holding-disk
Running Gentoo Linux
Secondary file- and home-dir-server for Research
Into service July 2003