> Is that an OS-dependent parameter? I always assumed it depended entirely
> on hardware. I have no way to test it for myself though, so I just leave
> full_page_writes=on to be safe.

It's a question of whether your HW+OS can guarentee no torn page writes for 
the xlog.  Running on Sun hardware combined with Solaris 10 with the xlog 
mounted forcedirectio, the Solaris folks are convinced we are torn-page-proof 
and so far we haven't been able to prove them wrong.  And, on Solaris it's a 
substantial performance gain (like, 8-10% on OLTP benchmarks).

Josh Berkus
PostgreSQL @ Sun
San Francisco

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