Filip Sneppe wrote: > Hi everyone, > > Suppose one has an ext3 filesystem on a SAN LUN. > I would like to know if it is possible to freeze this ext3 filesystem > into something > consistent from a filesystem point of view, then trigger the SAN's snapshotting > functionality, and then thaw the ext3 filesystem to resume I/O. This > would allow > near-instantaneous snapshot backups without having to use LVM or > LVM snapshots. > I think (but I might be wrong) that this feature is not implemented - yet - for ext3fs. However, LVM2 should allow to create read-write snapshots. Therefore, you can snapshot whenever you want, then mount the snapshot, like you would mount an « unclean » filesystem (i.e. the log will be replayed, and that's it). One might argue that this could give unconsistent snapshots ; however (the gurus will tell if I'm wrong) since your programs are running when you do the snapshot, it should not change anything whether you do a « hot » snapshot or a « thawed » snapshot. regards _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
