2010-11-12 13:52:25 -0800, chris (fool) mccraw: [...] > no snapshot = ~11sec (727MB/sec) > 1 snapshot = ~102sec (78MB/sec) > 2 snapshots = ~144sec (55MB/sec) > 3 snapshots = ~313sec (25MB/sec) > 4 snapshots = ~607sec (15MB/sec) [...] Yes, from 2 snapshots on a volume LVM snapshots become unusable. Other issues you may have with LVM snapshots with different versions: some grub versions failing to see LVM volumes once they have a snapshot, activating a volume group taking several minutes when there are quite filled up volumes. ddsnap (zumastor) worked great but is no longer maintained. So, you have: - LVM snapshots: poor performace or very few snapshots - ddsnap: got to stick with an old kernel - btrfs, not really production ready yet. Probably your best bet though. - fuse solutions, with all the fuse related issues. Quite frustrating as the technolgy is here and has been around for years. Sorry for not bringing any good news. I'm all ears for good alternative solutions though. Another solution I had looked at at some point: - qemu-nbd with qcow2: performance not there and a few issues as well. -- Stephane _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
