On Fri, 1 Aug 2008, Adam Hamsik wrote: > On Aug,Friday 1 2008, at 9:35 AM, Bombardier, Pascal wrote: > > > Hi, > > > > In your opinion, does it make sense to be able to create non-persistent > > snapshots ? > > In the case of a filesystem backup, a non-persistent snapshot would be a > > snapshot that we agree to lose in case of failure or reboot. If anything > > happens, a server administrator would have to recreate a new snapshot > > and then restart the backup. > > In this case, I think metadata could be stored in memory instead of on > > disk, which should improve LVM snapshot performance. > > > > Is this theory wrong, and is this something which can be implemented > > easily in the current LVM code ? > > > > AFAIK non-persistent snapshots are already implemented see > DM_PERSISTENT_DEV_FLAG ? I haven't look at linux kernel code how is > it done but when I solve my lvcreate -s bug on NetBSD non-persistent > snapshots are next :). > > Regards > > Adam. Yes. They are implemented in device mapper in kernel --- but no userspace lvm tool can use them. You can only create them using dmsetup. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
