I've been attempting to migrate my running server to RAID-1 using another hard drive identical to the current one. The general approach I've used is to create new drive to mirror the old one, set up the new drive as a degraded RAID-1 array using mdadm, rsync the contents of the old drive to the new drive, then add the old drive to the new RAID array when everything is working.
fdisk -l reports
Code:
Disk /dev/hda: 251.0 GB, 251000193024 bytes
255 heads, 63 sectors/track, 30515 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hda1 * 1 13 104391 fd Linux raid autodetect
/dev/hda2 14 30515 245007315 8e Linux LVM
#Disk /dev/hdb: 251.0 GB, 251000193024 bytes
255 heads, 63 sectors/track, 30515 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hdb1 * 1 13 104391 fd Linux raid autodetect
/dev/hdb2 14 30515 245007315 fd Linux raid autodetect
The old disk is /dev/hda and as can be seen I've successfully migrated over the boot partition to run on a RAID device /dev/md1 (though I still boot off hda1 instead of md1).
On /dev/md0 I've created a logical group /dev/lvm-raid with two logical volumes, lvm0 (filesystem) and lvm1 (swap, yeah raid-0 would be better for this).
Code:
# lvscan
ACTIVE '/dev/VolGroup00/LogVol00' [232.12 GB] inherit
ACTIVE '/dev/VolGroup00/LogVol01' [1.50 GB] inherit
ACTIVE '/dev/lvm-raid/lvm0' [232.12 GB] inherit
ACTIVE '/dev/lvm-raid/lvm1' [1.50 GB] inherit
# pvdisplay /dev/md0
--- Physical volume ---
PV Name /dev/md0
VG Name lvm-raid
PV Size 233.66 GB / not usable 0
Allocatable yes
PE Size (KByte) 4096
Total PE 59816
Free PE 9
Allocated PE 59807
PV UUID 9e8Ixn-xC4P-27qH-YrSP-KO8W-lfli-doMB34
But whenever I try to boot lvm0 using the following lines in grub
Code:
title Fedora Core raid (2.6.17-1.2174_FC5)
root (hd0,0)
kernel /vmlinuz-2.6.17-1.2174_FC5 ro root=/dev/lvm-raid/lvm0 rhgb quiet
quiet
initrd /initrd-2.6.17-1.2174_FC5.img
I get the following error during boot
Code:
Reading all physical volumes. This may take a while...
Found volume group "VolGroup00" using metadata type lvm2
2 logical volume(s) in volume group "VolGroup00" now active
mount: count not find filesystem '/dev/root'
setuproot: moving /dev failed: No such file or directory
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
switchroot: mount failed: No such file or directory
Kernel panic - not syncing: Attempted to kill init!
It seems to me that it's not detecting the lvm-raid volume group at startup.
I've tried rebuilding the boot image with
Code:
mkinitrd -v --with=raid1 /boot/initrd-2.6.17-1.2174_FC5.img 2.6.17-1.2174_FC5
as well as setting /dev/lvm-raid/lvm0 to be / in /ect/fstab but it doesn't seem to make any difference.
Does anyone know how I can successfully boot /dev/lvm-raid/lvm0 ?
thanks
