On Fri, 2006-28-04 at 12:58 -0700, Mike McMullen wrote: > Can anyone shed any light on why the i/o appears so slow? On 7500 RPM > SATA with drives I get buffered reads of around ~60-70MB. I have no idea - not a hardware guy. However, just for your information, this is what I get on a Dell PE 1600SC with a PERC 4/SC, and two SCSI 10K RPM drives in RAID 1, running RHEL 4: /dev/sda: Timing cached reads: 1748 MB in 2.00 seconds = 874.13 MB/sec Timing buffered disk reads: 202 MB in 3.03 seconds = 66.68 MB/sec I did that a few times, and the times were fairly consistent. However, I couldn't take the server offline, so it was done while it was in runlevel 3. As you can see, my buffered reads are about what you're expecting. My cached reads are much slower, though. Not sure why... Oh, you should check out the Dell Linux mailing list. You'll more than likely get more informed answers there. HTH, Ranbir -- Kanwar Ranbir Sandhu Linux 2.6.16-1.2069_FC4 i686 GNU/Linux 21:43:58 up 23 min, 2 users, load average: 0.27, 0.28, 0.31
