-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Fri, 18 Jan 2008 16:54:17 +0100 Hannes Dorbath <light@xxxxxxxxxxxxxxxxxxxx> wrote: > Sean Davis wrote: > > 150-200MB/s writing and somewhat faster for reading > > That actually seems dead slow. Whatever RAID level you configured, > there is no sane way for it to be that slow. Is this a RAID 5/6 > array? Did you forgot to align your file system to stripe boundaries? That seem that slow for SATA on a write. Assuming 20 (on each controller) disks random write I would guess the best you could pull off would be about 200 Megs a second. That's on a good day. So 200MBs per controllers isn't that out of bounds. I would agree that seems slow for reads though. And to answer the question, no I have not seen the behavior he is experiencing but to be honest I would never run that many sata drives. I would have long pushed to SAS on that scale. Sincerely, Joshua D. Drake - -- The PostgreSQL Company: Since 1997, http://www.commandprompt.com/ Sales/Support: +1.503.667.4564 24x7/Emergency: +1.800.492.2240 Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate SELECT 'Training', 'Consulting' FROM vendor WHERE name = 'CMD' -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHkOFvATb/zqfZUUQRAoPLAKCGLze19/Z5VZ/d4TVEQQUC18dTcgCeLVTD Abjvqf686r0eX2K1sxo8giY= =G5t+ -----END PGP SIGNATURE----- ---------------------------(end of broadcast)---------------------------TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
