On Mon, Apr 28, 2008 at 2:55 PM, Shachar Shemesh <[EMAIL PROTECTED]> wrote:
> Amos Shapira wrote:
>
> > Any ideas on how can I save this system without re-installing it?
> >
> >
> fsck?
Tried it. It checks out fine.
Also the switch to read-only seems to have happened while the system
was running.
I was doing more tests on this xen guest while rebuilding another xen
guest (using an automated script for the other one) and am beginning
to suspect that maybe having both of them use the same volume group
name might have something to do with it.
>
> Some types of errors cause the filesystem (if it's root) to be mounted read
> only.
>
> Also, try to mount the filesystem from outside of the Xen guest (i.e. -
> from the host). Is it mounted ok from there?
Yes. "kpartx -a"/"vgchange -ay .../"mount" works fine. Also force a
full filesystem check including bad-block scan.
I've since rebuilt the host by snapshotting a "gold" image which uses
"main" for the volume group name and renaming the volume group name
from "main" to "reecetest" (i.e. unique to that host). I updated
everything I could find on the guest's /etc file system (removed
/etc/lvm/cache/.cache, moved aside the files under /etc/lvs/backup and
/etc/lvm/archive) but still get the following error during Xen boot:
Loading xenblk.ko module
Registering block device major 202
xvda: xvda1 xvda2
xvdc: xvdc1
Loading dm-mod.ko module
device-mapper: ioctl: 4.11.0-ioctl (2006-09-14) initialised:
[EMAIL PROTECTED] dm-mirror.ko module
Loading dm-zero.ko module
Loading dm-snapshot.ko module
Scanning and configuring dmraid supported devices
Scanning logical volumes
Reading all physical volumes. This may take a while...
Found volume group "testvg" using metadata type lvm2
Found volume group "reecetest" using metadata type lvm2
Activating logical volumes
Volume group "main" not found
Creating root device.
Mounting root filesystem.
mount: could not find filesystem '/dev/root'
Setting up other filesystems.
Setting up new root fs
setuproot: moving /dev failed: No such file or directory
no fstab.sys, mounting internal defaults
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
Switching to new root and running init.
unmounting old /dev
unmounting old /proc
unmounting old /sys
switchroot: mount failed: No such file or directory
Kernel panic - not syncing: Attempted to kill init!
I.e. it looks like it still looks for "main" VG. I also updated the
grub config file (/boot/grub/grub.cnf on CentOS) to use the new VG for
the root file system name.
Here is the grub file inside the xen guest:
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-53.el5xen)
root (hd0,0)
kernel /vmlinuz-2.6.18-53.el5xen ro root=/dev/reecetest/root
console=xvc0
initrd /initrd-2.6.18-53.el5xen.img
Any more ideas?
Thanks,
--Amos
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