[CentOS] 3ware 9550 series

Peter Kjellström cap at nsc.liu.se
Fri Mar 3 16:30:34 UTC 2006

On Friday 03 March 2006 17:20, David Thompson wrote:
> Peter =?iso-8859-1?q?Kjellstr=F6m?= wrote:
> >I have two 8-port ones i a machine with 500GB hitachi drives, runs ok, but
> > = NCQ=20
> >needs extremely new firmware from hitachi. I've so far tried, among
> > other=20 things, raid0, raid5, lvm stripe over devices, heavy I/O while
> > rebuilding, = =2E.=20
> >everything but two performance problems looks fine (#1 ext3 sucks on
> > 3ware= =20
> >raid5, #2 I can't get good read performance on two raid5s in a lvm
> > stripe).
> Yeah, we've also seen performance issues with raid5 on the 9500 series
> products.  The benchmarks we run look good, but when we've put them into
> production file server environments, the performance has been
> disappointing. With 500GB disks now available for $4.95 down at the local
> Walgreen's, we've gone to raid 1 and are _very_ pleased with the
> performance.  Although it's been discouraged on this list, we're using xfs
> and the unsupported CentOS kernels and haven't had any problems.  We're
> anxiously waiting the 'new, improved' xfs drivers for CentOS :) :)

with xfs the 9550-SX is alot faster in raid5 than the 9500-S (have them both)


> Dave

  Peter Kjellström               |
  National Supercomputer Centre  |
  Sweden                         | http://www.nsc.liu.se
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