On 11/15/2010 05:29 PM, Cristian Rodríguez wrote:
El 15/11/10 22:25, Lew Wolfgang escribió:
/dev/md126: Timing cached reads: 20404 MB in 2.00 seconds = 10210.58 MB/sec Timing buffered disk reads: 1582 MB in 3.00 seconds = 527.19 MB/sec What hardware is this ?
It's a new Super-Micro desktop. I've got the full particulars at my office, but for now here's what I recall: CPU: One-each Intel Xeon W3680 @ 3.33GHz (top shows 12 cpus, with threading turned on) RAM: 12-GB RAID: Super-Micro (Intel compatible) Disk: Two-each Intel SSD SSDSA2M040G2GC 40-GB disks configured as RAID-0, 128-KB stripe size I have no idea if hdparm -tT is valid with a raid, I just thought I'd throw the number out. It also has a 2-TB Seagate Constellation drive, which shows: /dev/sda1: Timing cached reads: 19990 MB in 2.00 seconds = 10003.89 MB/sec Timing buffered disk reads: 380 MB in 3.00 seconds = 126.64 MB/sec This box is a bit of a test case, with the OS (openSuSE 11.3) and swap on the SSD Raid-0. It's working well so far. I don't really care about the SSD "trim" issue, since OS support doesn't work with RAIDs yet. I've got another identical box with the SSD RAID-0 configured with 4-KB stripes. It shows: /dev/md126: Timing cached reads: 21024 MB in 2.00 seconds = 10521.17 MB/sec Timing buffered disk reads: 1160 MB in 3.00 seconds = 386.62 MB/sec So it looks like the larger stripe sizes are better with SSDs, if you can believe hdparm. Regards, Lew -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org