Ron Mayer wrote:
I know less about other file systems. Apparently the NTFS guys are aware of such stuff - but don't know what kinds of fsync equivalent you'd need to make it happen.
It's actually pretty straightforward--better than ext3. Windows with NTFS has been perfectly aware how to do write-through on drives that support it when you execute _commit for some time: http://msdn.microsoft.com/en-us/library/17618685(VS.80).aspx
If you switch the postgresql.conf setting to fsync_writethrough on Windows, it will execute _commit where it would execute fsync on other platforms, and that pushes through the drive's caches as it should (unlike fsync in many cases). More about this at http://archives.postgresql.org/pgsql-hackers/2005-08/msg00227.php and http://www.westnet.com/~gsmith/content/postgresql/TuningPGWAL.htm (which also covers OS X).
-- Greg Smith 2ndQuadrant US Baltimore, MD PostgreSQL Training, Services and Support greg@xxxxxxxxxxxxxxx www.2ndQuadrant.us -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
