On Aug 11, 2005, at 12:58 PM, Jeffrey W. Baker wrote:

Like Mr. Stone said earlier, this is pure dogma.  In my experience,
xlogs on the same volume with data is much faster if both are on
battery-backed write-back RAID controller memory.  Moving from this
situation to xlogs on a single normal disk is going to be much slower in
most cases.

This does also point one important point about performance. Which is a touch unfortunate (and expensive to test): Your milage may vary on any of these improvements. Some people have 0 problems and incredible performance with say, 1000 shared_bufs and the WAL on the same disk.. Others need 10k shared bufs and wal split over a 900 spindle raid with data spread across 18 SAN's...
Unfortunately there is no one true way :(

The best bet (which is great if you can): Try out various settings.. if you still run into problems look into some more hardware.. see if you can borrow any or fabricate a "poor man"'s equivalent for testing.


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