> We have a PowerEdge 2950 with an "LSISAS1068E" controller, hooked up to > two Seagate 1TB SATA disks. For some reason the performance of these > disks is quite poor - I'm lucky to get over 10MB/sec from them, when I > should be getting closer to 100MB/sec.
10MB/sec does seem extremely poor. we've had read slowness when Linux block device read-ahead was too small. Once properly configured, performance on RAID-5 went from 150MB/sec to 500MB/sec, so the difference is dramatic. we usually tune read-ahead (in Linux) buffers starting from 8MB to 32MB and benchmark to see what works best. but your problem may be elsewhere... we've never seen 10MB/sec... > Having recently had a bad experience with one of Dell's SATA RAID > controllers (of which I wasn't the only one), I'm wondering whether > this > is going to be a repeat of that? Does anyone have a SAS controller > similar to this with SATA disks? Does it also suffer poor throughput > or > is it just me? On the PERC5/I, 8x HDD, RAID-5, we can get 400-500MB/sec sequential read/writes. I believe PERC5/I uses the LSISAS1068E with a Intel IOP333. -Bond _______________________________________________ Linux-PowerEdge mailing list [email protected] https://lists.us.dell.com/mailman/listinfo/linux-poweredge Please read the FAQ at http://lists.us.dell.com/faq
