Justin Graf wrote:
On 6/22/2010 4:31 AM, Grzegorz Jaśkiewicz wrote:
Would moving WAL dir to separate disk help potentially ?
Yes it can have a big impact.
WAL on a separate spindle will make a HUGE difference in performance. TPS rates frequently double OR BETTER with WAL on a dedicated spindle.
Strongly recommended.
Be aware that you must pay CLOSE ATTENTION to your backup strategy if WAL is on a different physical disk. Snapshotting the data disk where WAL is on a separate spindle and backing it up **WILL NOT WORK** and **WILL** result in an non-restoreable backup.
The manual discusses this but it's easy to miss.... don't or you'll get a NASTY surprise if something goes wrong.....
-- Karl