Ross Smith wrote: >> Snapshots are not replacements for traditional backup/restore features. >> If you need the latter, use what is currently available on the market. >> -- richard >> > > I'd actually say snapshots do a better job in some circumstances. > Certainly they're being used that way by the desktop team: > http://blogs.sun.com/erwann/entry/zfs_on_the_desktop_zfs >
Yes, this is one of the intended uses of snapshots. But snapshots do not replace backup/restore systems. > None of this is stuff I'm after personally btw. This was just my > attempt to interpret the request of the OP. > > Although having said that, the ability to restore single files as fast > as you can restore a whole snapshot would be a nice feature. Is that > something that would be possible? > > Say you had a ZFS filesystem containing a 20GB file, with a recent > snapshot. Is it technically feasible to restore that file by itself > in the same way a whole filesystem is rolled back with "zfs restore"? > cp > If the file still existed, would this be a case of redirecting the > file's top level block (dnode?) to the one from the snapshot? If the > file had been deleted, could you just copy that one block? > > Is it that simple, or is there a level of interaction between files > and snapshots that I've missed (I've glanced through the tech specs, > but I'm a long way from fully understanding them). > It is as simple as a cp, or drag-n-drop in Nautilus. The snapshot is read-only, so there is no need to cp, as long as you don't want to modify it or destroy the snapshot. -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
