[CentOS] Hosed my software RAID/LVM setup somehow
Ross S. W. Walker
rwalker at medallion.com
Wed Oct 17 16:23:51 UTC 2007
Kai Schaetzl wrote:
> Luciano Rocha wrote on Wed, 17 Oct 2007 16:08:31 +0100:
> > mount uses /etc/mtab for displaying current mounts, which is invalid
> > when starting the boot. Check /proc/mounts for the correct values.
> > You can switch to rw with:
> > mount / -o remount,rw
> > And then you'll be able to change fstab.
> Yeah, this worked, thanks. I'll write that down :-)
> It would be nice if the system would ignore the problems with
> md2 and md3 and
> boot nevertheless as in this case it would have been harmless.
> > the b option to init/boot boots in emergency mode.
> If needed, where would I do that? Can I do an init -b 3 in
> the repair shell or
> where would I do this?
> > Seems to be OK. What is happening is that you're telling
> the system to
> > check the filesystems that where in the MDs in fstab. As
> there's none
> > (it's lvm now), the boot process complains and drops you to a shell.
> Indeed. I thought that using LVM manager would make the
> necessary changes
> (whatever they were) for me. I always avoided LVM as much as
> I could until
> recently and when I used it I did that already during
> installation. This was
> the first time I changed this stuff on a running system. I
> learned something
> today :-) I added the /dev/mapper entries as mounts to fstab
> now and remounted
> all and everything is well. Thanks for the quick help!
> I have a small question, though: one of the LVM partitions is
> used for a
> (non-active) Xen VM and I cannot mount that as ext3. I know I
> have to unmount
> before I can run the VM on it. I want to have a look in it.
> Is there a way to
> mount it? xdva isn't recognized as a filesystem.
The LVM has a nested MBR, you will need to use a loopback
specifying the offset of the partition within to get it to
# fdisk -l -u /dev/es_storage/exch_data.1
Disk /dev/es_storage/exch_data.1: 218.2 GB, 218233831424 bytes
255 heads, 63 sectors/track, 26532 cylinders, total 426237952 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/es_storage/exch_data.1p1 128 426220514 213110193+ 7 HPFS/NTFS
# mount -t ntfs -o loop,offset=128 /dev/es_storage/exch_data.1 /mnt
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