Samuel Gendler wrote:
6 internal drives on battery backed raid (I don't know what RAID level - is there a way to discover this?), all in a single filesystem, so WAL and data are on the same filesystem. I don't believe that we are taking advantage of the battery backed controller, since I only see this in /etc/fstab: UUID=12dcd71d-8aec-4253-815c-b4883195eeb8 / ext3 defaults 1 1
That doesn't tell you anything about whether the card's write cache is being used or not. What you need to do is install the monitoring tools provided by the manufacturer of the card, which will let you check both the RAID level and how the cache is setup. I can't give any more specific instructions because you left out a vital piece of system information: what RAID card you actually have.
-- Greg Smith 2ndQuadrant US Baltimore, MD PostgreSQL Training, Services and Support greg@xxxxxxxxxxxxxxx www.2ndQuadrant.us -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
