I've used LVM on other machines, but had not yet tried the snapshot feature.
I just built a machine with a 3ware SATA RAID controller, and used LVM on the /dev/sda device it presents. When I try to mount a snapshot, I get a message:
Mount: wrong fs type, bad option, bad superblock on /dev/fast/snap,
or too many mounted file systems
Is the problem dependent on the RAID controller? I created a VG and LV based on a normal ATA partition, and got the same error message on attempting to mount.
I tried on my previous machines, and they allow mounting snapshots with no problem.
WORKING CONFIGURATION Slackware 8.1 linux kernel 2.4.22 mount version mount-2.11r LVM version in kernel 1.0.5+(22/07/2002) LVM tools version vgdisplay --version gives 1.0.7 Filesystem reiserfs
NON-SNAPSHOT MOUNTING CONFIGURATION Slackware 9.1 linux kernel 2.4.23 mount version mount-2.12 LVM version in kernel 1.0.7(28/03/2003) LVM tools version vgdisplay --version gives 1.0.7 Filesystem: ext3
ADDITIONAL TESTS dmesg shows for ext3 file systems EXT3-fs: INFO: recovery required on readonly filesystem EXT3-fs: write access unavailable, cannot proceed and doesn't mount
for reiserfs Can't write to read-only device 3a:03 repeated several times, but mounts finally
To get snapshots to work with ext3, I must first unmount the source volume and create the snapshot. Then I can get the snapshot to mount. Trying again later, making a snapshot with the volume mounted, the snapshot fails to mount.
Once I made a snapshot of the unmounted reiserfs volume, subsequent snapshots of the mounted reiserfs volume appear to mount as expected. This appears to hold true on the IDE disk partition and the 3ware raid card disk device.
Anyone else notice this type of behavior with snapshots?
Anyone else using snapshots for database backups?
Thanks,
John
-- __________________________________________________________________ John Seifarth http://www.waw.be/waw/ Words & Wires SPRL lists@waw.be Computer Consulting & Language Services Voice: (+) 32-2-660-3943 1160 Brussels, Belgium Fax: (+) 32-2-675-3922
_______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
