On Thu, 21 May 2009, Scott Marlowe wrote:
But in a RAID-10 you aggreate pairs like RAID-0, so you could write 250(n/2) times per second on 15k where n=4 and 166(n/2) for 10k drives where n=8. So 500 versus 664... ? Or am I getting it wrong.
Adding more spindles doesn't improve the fact that the disks can only commit once per revolution. WAL writes are way too fine grained for them to get split across stripes to improve the commit rate.
-- * Greg Smith gsmith@xxxxxxxxxxxxx http://www.gregsmith.com Baltimore, MD -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
