On Jan 23, 2008 8:16 AM, Tomasz Chmielewski <mangoo@xxxxxxxx> wrote: > Vijai Babu Madhavan, Thu, 11 Jan 2007 11:18:13 -0700, wrote: > > > The problem of DM snapshots with multiple snapshots have been discussed > > in the lists quiet a bit (Most recently @ > > https://www.redhat.com/archives/dm-devel/2006-October/msg00034.html). > > > > We are currently in the process of building a DM snapshot target that scales > > well with many snapshots (so that the changed blocks don't get copied to each > > snapshot). In this process, I would also like to validate an assumption. > > Any news on that? > > Still, with multiple snapshots write performance degrades linearly - is > any work done to change that anytime soon? Yes. Dan Phillips has implemented a shared snapshot exception store. You can try it out now if you like; it's at http://zumastor.org. It feels a bit different from the user's point of view than LVM, though. It plays well with the device mapper and can be used with any block device (LVM or non-LVM). - Dan -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
