From: | Karl Denninger <karl(at)denninger(dot)net> |
---|---|
To: | Justin Graf <justin(at)magwerks(dot)com> |
Cc: | Grzegorz Jaśkiewicz <gryzman(at)gmail(dot)com>, postgres performance list <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: raid10 write performance |
Date: | 2010-06-22 14:29:53 |
Message-ID: | 4C20C8E1.7060306@denninger.net |
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Lists: | pgsql-performance |
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
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