On Wed, Apr 18, 2007 at 04:32:18PM -0400, Dennis Clarke wrote:
> I just finished installing Solaris 10 and ZFS at a manufacturing site
> that needs fast cheap storage. Its real tough to argue with ZFS once
> you see it in action. They were sold and I went ahead with a few
> terabytes of storage attached to a Sun UltraSparc server. Everyone is
> happy until the question came up about "how to back it up?"
>
> This is where a netbackup solution is being used. A Netbackup machine
> mounts the various ZFS filesystems via NFS and then dumps to tape.
> Nightly.
But netbackup should work fine for ZFS (has support for ZFS ACLs been
added?).
ZFS can improve the situation by speeding up incremental dumps since it
knows just what changed (ah, but it doesn't quite -- it knows what
blocks and what dnodes changed, but there's no dnode->{dir dnode, link
name} index, so currently working out what files to backup may not be
much faster by taking advantage of native ZFS features than by the
traditional fs walk, stat and compare approach.
Nico
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