From: Mark Lewis <mark.lewis@mir3.com>
To: Brian Wipf <brian@clickspace.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: File Systems Compared
Date: Wed, 06 Dec 2006 08:55:14 -0800
Message-ID: <1165424114.9734.298.camel@archimedes> (raw)
In-Reply-To: <82bqmh3rfc.fsf@mid.bfk.de>
References: <BEB285F8-0BD2-4524-BD46-B1D35E7EFBEB@clickspace.com>
<82bqmh3rfc.fsf@mid.bfk.de>
> Anyone run their RAIDs with disk caches enabled, or is this akin to
> having fsync off?
Disk write caches are basically always akin to having fsync off. The
only time a write-cache is (more or less) safe to enable is when it is
backed by a battery or in some other way made non-volatile.
So a RAID controller with a battery-backed write cache can enable its
own write cache, but can't safely enable the write-caches on the disk
drives it manages.
-- Mark Lewis
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To: pgsql-performance@postgresql.org
Cc: mark.lewis@mir3.com, brian@clickspace.com
Subject: Re: File Systems Compared
In-Reply-To: <1165424114.9734.298.camel@archimedes>
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