LinuxQuestions.org - Trouble booting a degraded RAID-1 array

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