[linux-lvm] could not mount LVM2 read only snapshot

[linux-lvm] could not mount LVM2 read only snapshot

[Michael Jiang]

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I use 'lvcreate -p r' to create a read only snapshot. got following error
message when I try to mount it

"mount: wrong fs type, bad option, bad superblock on /dev/VolGroup00/snap,
      or too many mounted file systems"

If I do not use '-p r' and mount -r, then it works fine.

kernel 2.6.9-42.ELsmp
# lvm version
  LVM version:     2.02.06 (2006-05-12)
  Library version: 1.02.07 (2006-05-11)
  Driver version:  4.5.0

Anyone had the same problem before?

Thanks

Michael

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Re: [linux-lvm] could not mount LVM2 read only snapshot

[Bryn M. Reeves]

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Michael Jiang wrote:
> I use 'lvcreate -p r' to create a read only snapshot. got following
> error message when I try to mount it
> 
> "mount: wrong fs type, bad option, bad superblock on /dev/VolGroup00/snap,
>       or too many mounted file systems"
> 
> If I do not use '-p r' and mount -r, then it works fine.
> 

Working fine here:

# lvcreate -L 10M -pr -s -n l0-snap /dev/vg0/l0
  Rounding up size to full physical extent 12.00 MB
  Logical volume "l0-snap" created

# mount -oro /dev/vg0/l0-snap /mnt/snap

# umount  /mnt/snap

# mount /dev/vg0/l0-snap /mnt/snap
mount: block device /dev/vg0/l0-snap is write-protected, mounting read-only

# lvm version
  LVM version:     2.02.21-RHEL4 (2007-03-26)
  Library version: 1.02.17-RHEL4 (2007-02-02)
  Driver version:  4.5.5

Regards,
Bryn.

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