Configure the amanda workspace as a UFS stripe. The features of ZFS are not entirely 'free'. My benchmarks indicate that a UFS stripe will out-perform a ZFS stripe by 20% or more.
On Tue, Sep 15, 2009 at 09:56:46AM -0400, Brian Cuttler wrote: > > I am running amanda 1.6.1.p1 on Solaris 10/x86. > The only client is the server itself. > > There are 17 DLEs in amanda's disklist, while only 15 mount points > are listed, I'd divided /stations (it needs to be divided differently > but that is a negligable issue). > > I am running zfs-snapshots with server estimates excepting the > since UFS file system /. > > From the very bottom of the list you can see that I have allocated > another zfs array for use as amanda work, it holds 4 Terra which > should be enough to dump all of the other paritions concurrently, > we aren't doing so, but holding space is not our performance block. > > Our performance block, per system monitoring is the throughput > to the amanda work area. We had it configured as raid, its now > a stripe, with no better performance per our test suite. > > What if any switches can I tune (either within amanda or in ZFS) > to get better I/O across the work area drives ? The array consists > of 8 750Gig spindles a an ultra 320 bus. > > We output to an SL24/LTO4. >
