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
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