Re: File Systems Compared

From: Florian Weimer <fweimer(at)bfk(dot)de>
To: Brian Wipf <brian(at)clickspace(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: File Systems Compared
Date: 2006-12-06 16:44:23
Message-ID: 82bqmh3rfc.fsf@mid.bfk.de
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* Brian Wipf:

> Anyone run their RAIDs with disk caches enabled, or is this akin to
> having fsync off?

If your cache is backed by a battery, enabling write cache shouldn't
be a problem. You can check if the whole thing is working well by
running this test script: <http://brad.livejournal.com/2116715.html>

Enabling write cache leads to various degrees of data corruption in
case of a power outage (possibly including file system corruption
requiring manual recover).

--
Florian Weimer <fweimer(at)bfk(dot)de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99

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