On Wed, Jun 23, 2010 at 6:06 AM, Ivan Voras <ivoras@xxxxxxxxxxx> wrote: > On 06/22/10 16:40, Greg Smith wrote: >> Grzegorz Jaśkiewicz wrote: >>> raid: serveRAID M5014 SAS/SATA controller >>> >> >> Do the "performant servers" have a different RAID card? This one has >> terrible performance, and could alone be the source of your issue. The >> ServeRAID cards are slow in general, and certainly slow running RAID10. > > What are some good RAID10 cards nowadays? LSI, Areca, 3Ware (now LSI I believe) > On the other hand, RAID10 is simple enough that soft-RAID > implementations should be more than adequate - any ideas why a dedicated > card has it "slow"? This is mostly a problem with some older cards that focused on RAID-5 performance, and RAID-10 was an afterthought. On many of these cards (older PERCs for instance) it was faster to either use a bunch of RAID-1 pairs in hardware with RAID-0 in software on top, or put the thing into JBOD mode and do it all in software. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
