Until recently I was backing up all my domUs using a strategy based on LVM snapshots. All my disk block devices are provided by LVM so I was just regularly mounting a snapshot in dom0 and then using rsnapshot (based on rsync) to take backups without fear of changing database files etc. This was nice because it meant that I didn''t have to do anything in each domU. I didn''t have to arrange for access to the domU, or worry about what was running in the domU that could screw up my backups. Unfortunately I have had to stop using LVM snapshots. It seems since I got to the point of having quite a few snapshots active, there are stability issues. In the last two months, on mounting a snapshot LV the mount command has just hung and so have all accesses to the LV that the snapshot is being made from. That kills a domU and prevents it from being started again. To get out of that I''ve had to reboot dom0. So for a while now I''ve been running without any snapshots mounted, and without doing any backups. I was wondering what other people do about backing up their domUs. Of course I could treat them as separate boxes and configure backup software on each, but I was hoping that what with all the block devices coming from dom0 anyway that there would be a good way to access them read-only there in one place. Can any of the cluster filesystems, or NDB flavours help with this? Thanks, Andy _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
> Unfortunately I have had to stop using LVM snapshots. It > seems since I got to the point of having quite a few > snapshots active, there are stability issues. In the last > two months, on mounting a snapshot LV the mount command has > just hung and so have all accesses to the LV that the > snapshot is being made from. That kills a domU and prevents > it from being started again. To get out of that I''ve had to > reboot dom0.I think the folks at RH would be interested to hear of such problems with LVM, and there''s a good chance they''ll be fixed. Try emailing Alasdair G Kergon. Ian _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
>> Unfortunately I have had to stop using LVM snapshots. It >> seems since I got to the point of having quite a few >> snapshots active, there are stability issues. In the last >> two months, on mounting a snapshot LV the mount command has >> just hung and so have all accesses to the LV that the >> snapshot is being made from. That kills a domU and prevents >> it from being started again. To get out of that I''ve had to >> reboot dom0. > > I think the folks at RH would be interested to hear of such problems > with LVM, and there''s a good chance they''ll be fixed. Try emailing > Alasdair G Kergon. > > IanI''m been planning to use the same solution for domU backups, e.g. lvm-snapshots, and I''m very interested in any solution to the problem. We are using TSM (Tivoli Storage Management) as backup solution, and the license count (read: money) would be rather large if each domU should have a client installed. I would prefer to do it all from dom0. How are all of You (xen-users) managing backup of Your domU''s ?? Thanks, Jorgen _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users