On Tue, 10 Nov 2009, Greg Smith wrote:
> Laurent Laborde wrote:
>> It is on a separate array which does everything but tablespace (on a
>> separate array) and indexspace (another separate array).
>>
> On Linux, the types of writes done to the WAL volume (where writes are
> constantly being flushed) require the WAL volume not be shared with anything
> else for that to perform well. Typically you'll end up with other things
> being written out too because it can't just selectively flush just the WAL
> data. The whole "write barriers" implementation should fix that, but in
> practice rarely does.
I believe that this is more a EXT3 problem than a linux problem.
David Lang