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 :) :)
Dave