On 16/07/10 06:18, Ben Chobot wrote: > There are also caches on all your disk drives. Write caching there is always > dangerous, which is why almost all raid cards always disable the hard drive > write caching, with or without a BBU. I'm not even sure how many raid cards > let you enable the write cache on a drive... hopefully, not many.
AFAIK Disk drive caches can be safe to leave in write-back mode (ie write cache enabled) *IF* the OS uses write barriers (properly) and the drive understands them. Big if. -- Craig Ringer -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
