Kevin Grittner wrote: > Jesper Krogh <jesper@xxxxxxxx> wrote: > > > Sorry if it is obvious.. but what filesystem/OS are you using and > > do you have BBU-writeback on the main data catalog also? > > Sorry for not providing more context. > > ATHENA:/var/pgsql/data # uname -a > Linux ATHENA 2.6.16.60-0.39.3-smp #1 SMP Mon May 11 11:46:34 UTC > 2009 x86_64 x86_64 x86_64 GNU/Linux > ATHENA:/var/pgsql/data # cat /etc/SuSE-release > SUSE Linux Enterprise Server 10 (x86_64) > VERSION = 10 > PATCHLEVEL = 2 > > File system is xfs noatime,nobarrier for all data; OS is on ext3. I > *think* the pg_xlog mirrored pair is hanging off the same > BBU-writeback controller as the big RAID, but I'd have to track down > the hardware tech to confirm, and he's out today. System has 16 > Xeon CPUs and 64 GB RAM. I would be surprised if the RAID controller had a BBU-writeback cache. I don't think having xlog share a BBU-writeback makes things slower, and if it does, I would love for someone to explain why. -- Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us EnterpriseDB http://enterprisedb.com + If your life is a hard drive, Christ can be your backup. + -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
