Onyx, Just thinking about it, using snapshots as glusterfs storage volumes is not advisable unless you know what you are doing. If you roll back a volume, it will depend on how selfheal of unify/afr handle it. AFR would just update the rolled back volume with the other copy. Better use of LVM + glusterfs would be to grow the backend FS as an when needed. I think use case of snapshots just in backend LVM in a glusterfs environment will not be much. However snapshots in a glusterfs as a whole filesystem will be useful. Krishna On Sat, Jun 14, 2008 at 4:13 PM, Onyx <lists@xxxxxxxx> wrote: > Hmm, yes, what was I thinking.... > > But if I want to use LVM snapshots underneath glusterfs volumes (on > different bricks) who are then unified or afr'd, won't there be a problem > because the snapshots aren't taken at exactly the same time? Or what would > be the expected behavior if I for example roll back one volume in an afr > setup and not the other? > > > > > > Anand Babu Periasamy wrote: >> >> -- >> Anand Babu Periasamy >> GPG Key ID: 0x62E15A31 >> Blog [http://ab.freeshell.org] >> The GNU Operating System [http://www.gnu.org] >> Z RESEARCH Inc [http://www.zresearch.com] >> >> Hi Onyx, >> GlusterFS volumes are file based. LVM requires block based >> store. You cannot have LVM over GlusterFS. I am assuming >> you are asking about GlusterFS over LVM. You can use LVM and >> its snapshotting ability underneath the GlusterFS posix volume. >> It will work transparently. >> >> -- >> Anand Babu Periasamy >> GPG Key ID: 0x62E15A31 >> Blog [http://ab.freeshell.org] >> The GNU Operating System [http://www.gnu.org] >> Z RESEARCH Inc [http://www.zresearch.com] >> >> >> >> Onyx wrote: >>> >>> Has anyone ever tested LVM on top of a glusterfs volume? Would this even >>> be possible? >>> I'm interested because of the snapshot feature of LVM. >>> >>> Thanks! >>> >>> >>> _______________________________________________ >>> Gluster-devel mailing list >>> Gluster-devel@xxxxxxxxxx >>> http://lists.nongnu.org/mailman/listinfo/gluster-devel > > > > _______________________________________________ > Gluster-devel mailing list > Gluster-devel@xxxxxxxxxx > http://lists.nongnu.org/mailman/listinfo/gluster-devel >
