| From: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
|---|---|
| To: | Tino Wildenhain <tino(at)wildenhain(dot)de> |
| Cc: | Javier Somoza <jsomoza(at)pandasoftware(dot)es>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: fsync and battery-backed caches |
| Date: | 2006-02-28 00:22:23 |
| Message-ID: | 20060228002223.GW82012@pervasive.com |
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| Thread: | |
| Lists: | pgsql-performance |
On Mon, Feb 27, 2006 at 11:12:57AM +0100, Tino Wildenhain wrote:
> Javier Somoza schrieb:
> >
> > Hi all
> >
> > Is it secure to disable fsync havin battery-backed disk cache?
> >
> > Thx
> >
> No. fsync moves the data from OS memory cache to disk-adaptor
> cache which is required to benefit from battery backup.
More importantly, in guarantees that data is committed to non-volatile
storage in such a way that PostgreSQL can recover from a crash without
corruption.
If you have a battery-backed controller and turn on write caching you
shouldn't see much effect from fsync anyway.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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