> > What drive configuration are you using (SCSI / ATA / SATA), what chipset > is > > providing the disk interface and what cpu are you running with? > 3xSATA, Seagate 320 ST3320620AS, Intel 6600, ICH7 controller using the > ata-piix driver, with drive cache set to write-back. It's not obvious to > me why that matters, but if it helps you see the problem I''m glad to > provide the info. I'm seeing ~50MB/s on the raw drive, and 3x that on > plain stripes, so I'm assuming that either the RAID-5 code is not > working well or I haven't set it up optimally. If it had been ATA, and you had two drives as master+slave on the same cable, then they would be fast individually but slow as a pair. RAID-5 is higher overhead than RAID-0/RAID-1 so if your CPU was slow then you would see some degradation from that too. We have similar hardware here so I'll run some tests here and see what I get... - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
