On Thu, Dec 01, 2005 at 11:03:03PM -0700, Nicholas Leippe wrote: > On Thursday 01 December 2005 10:55 pm, Andrew McNabb wrote: > > The DM system in Linux can do a snapshot (I believe LVM has an interface > > to it). It's a very simple approach. > > What kind of performance impact does it have? Are there any constraints? >
As far as I understand, the performance impact is negligible. However, it is a pretty new feature, and from what I can tell on the web, each individual filesystem needs to support it by being able to flush just before the snapshot is taken. It looks like xfs is the best-tested with it. All of this is just what I could glean from mailing list comments, so take it with a grain of salt. I imagine that in the near future, LVM snapshots will become pretty practical. -- Andrew McNabb http://www.mcnabbs.org/andrew/ PGP Fingerprint: 8A17 B57C 6879 1863 DE55 8012 AB4D 6098 8826 6868
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