To be honest, I've yet to run across a SCSI configuration that can touch the 3ware SATA controllers. I have yet to see one top 80MB/sec, let alone 180MB/sec read or write, which is why we moved _away_ from SCSI. I've seen Compaq, Dell and LSI controllers all do pathetically badly on RAID 1, RAID 5 and RAID 10.
35MB/sec for a three drive RAID 0 is not bad, it's appalling. The hardware manufacturer should be publicly embarassed for this kind of speed. A single U320 10k drive can do close to 70MB/sec sustained. If someone can offer benchmarks to the contrary (particularly in linux), I would be greatly interested. Alex Turner netEconomist On Mar 29, 2005 8:17 AM, Dave Cramer <[EMAIL PROTECTED]> wrote: > Yeah, 35Mb per sec is slow for a raid controller, the 3ware mirrored is > about 50Mb/sec, and striped is about 100 > > Dave > > PFC wrote: > > > > >> With hardware tuning, I am sure we can do better than 35Mb per sec. Also > > > > > > WTF ? > > > > My Laptop does 19 MB/s (reading <10 KB files, reiser4) ! > > > > A recent desktop 7200rpm IDE drive > > # hdparm -t /dev/hdc1 > > /dev/hdc1: > > Timing buffered disk reads: 148 MB in 3.02 seconds = 49.01 MB/sec > > > > # ll "DragonBall 001.avi" > > -r--r--r-- 1 peufeu users 218M mar 9 20:07 DragonBall > > 001.avi > > > > # time cat "DragonBall 001.avi" >/dev/null > > real 0m4.162s > > user 0m0.020s > > sys 0m0.510s > > > > (the file was not in the cache) > > => about 52 MB/s (reiser3.6) > > > > So, you have a problem with your hardware... > > > > ---------------------------(end of broadcast)--------------------------- > > TIP 7: don't forget to increase your free space map settings > > > > > > -- > Dave Cramer > http://www.postgresintl.com > 519 939 0336 > ICQ#14675561 > > ---------------------------(end of broadcast)--------------------------- > TIP 6: Have you searched our list archives? > > http://archives.postgresql.org > ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
