5 ms·
There are two kinds of LVM snapshots: thick and thin. You're probably thinking of conventional (thick) snapshots, rather than the newer thinly provisioned snaps
by cmurf 7y ago
There are two kinds of LVM snapshots: thick and thin. You're probably thinking of conventional (thick) snapshots, rather than the newer thinly provisioned snapshots. Snapshotting an LV will FIFREEZE the file system, then snapshot, then FITHAW the file system. So depending on how dirty things are, it might take a while for the snapshot to happen, but otherwise they are nearly instant to create and destroy.
- rodgerd 7y agoI am aware of the difference - and even the much-touted thins are very poor by comparison, as anyone who has had the displeasure of trying to use them in anger can attest.
- cmurf 7y agoI have but only small scale: single 2T drive and data, with maybe a dozen snapshots. I use Btrfs for most everything these days, with ZFS archive. The biggest issue I had, a while back now, with thinp is if the metadata volume gets full...kaboom. And it's non-trivial to repair.