Raid 5 (was: Mounting of Linux volumes)
amcnabb at mcnabbs.org
Thu Dec 1 23:30:54 MST 2005
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
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.
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