| From: | Greg Smith <greg(at)2ndquadrant(dot)com> |
|---|---|
| To: | Ron Mayer <rm_pg(at)cheapcomplexdevices(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, pgsql-performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: SSD + RAID |
| Date: | 2010-02-23 01:14:47 |
| Message-ID: | 4B832C07.60301@2ndquadrant.com |
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| Lists: | pgsql-performance |
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(at)2ndQuadrant(dot)com www.2ndQuadrant.us
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