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Date: Wed, 2 Jul 2008 17:15:58 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Configuring an older server for speed...
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>
> I'm not sure that diskd is still preferred for FreeBSD. The three
> cache types: ufs,aufs and diskd are all the same on disk. diskd is ufs
> with extra processes to handle disk access, aufs uses threads instead.

i don't know what is preferred. i know what works.

only ufs and diskd is reliable, ufs is single threaded and blocking, 
diskd=one process for each spool dedicated just for disk I/O