Scott Carey wrote: > On 11/24/09 11:13 AM, "Scott Marlowe" <scott.marl...@gmail.com> wrote: > > > >> They get good reviews as well. Both manufacturers have their "star" >> performers, and their "utility" or work group class controllers. For >> what you're doing the areca 12xx or 3ware 95xx series should do fine. >> > > -1 to 3ware's SATA solutions > > 3ware 95xx and 96xx had performance somewhere between PERC 5 (horrid) and > PERC 6 (mediocre) when I tested them with large SATA drives with RAID 10. > Haven't tried raid 6 or 5. Haven't tried the "SA" model that supports SAS. > When a competing card (Areca or Adaptec) gets 3x the sequential throughput > on an 8 disk RAID 10 and only catches up to be 60% the speed after heavy > tuning of readahead value, there's something wrong. > Random access throughput doesn't suffer like that however -- but its nice > when the I/O can sequential scan faser than postgres can read the tuples. > What operating system?
I am running under FreeBSD with 96xx series and am getting EXCELLENT performance. Under Postgres 8.4.x on identical hardware except for the disk controller, I am pulling a literal 3x the iops on the same disks that I do with the Adaptec (!) I DID note that under Linux the same hardware was a slug. Hmmmmm... -- Karl
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