Craig James <craig_james@xxxxxxxxxxxxxx> wrote: > After a reading various articles, I thought that "noop" was the > right choice when you're using a battery-backed RAID controller. > The RAID controller is going to cache all data and reschedule the > writes anyway, so the kernal schedule is irrelevant at best, and can > slow things down. Wouldn't that depend on the relative sizes of those caches? In a not-so-hypothetical example, we have machines with 120 GB OS cache, and 256 MB BBU RAID controller cache. We seem to benefit from elevator=deadline at the OS level. -Kevin -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
