On May 20, 2008 23:19 +0200, Bas van Schaik wrote: > Theodore Tso wrote: > > Andreas is right though that if you are taking a proper snapshot, the > > disk really should be quiesced and no journal replay should be > > required at all. That's how a devicemapper snapshot works in LVM --- > > so one good question to explore is how *are* you doing your snapshots. > > Exactly my thoughts, but apparently something is wrong here too. Maybe I > should note that my journal commit interval is set to something like 5 > or 10 seconds, is that relevant? No, this is normal. > Again a small snippet of bash responsible for snapshotting: > > snapshot_stamp=`date +%Y%m%d-%H%M%S` > > lvcreate --snapshot --size 50G --name backups-snapshot-$snapshot_stamp > > $LV &> $TMPLOGFILE > > This is not a weird way to snapshot, is it? No, this is normal, yet it doesn't seem to work correctly. Can you please add some sort of debug message into ext3_write_super_lockfs() and ext3_unlockfs() to make sure these functions are being called for your filesystem when you are doing the snapshot. Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
