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Re: XFS and DPX files

To: xfs@xxxxxxxxxxx
Subject: Re: XFS and DPX files
From: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Date: Mon, 2 Nov 2009 22:58:35 +0100
In-reply-to: <20091102185249.0da8e388@xxxxxxxxxxxxxxxxxxxx>
Organization: it-management http://it-management.at
References: <4AEC2CF4.8040703@xxxxxxx> <200911021205.28006@xxxxxx> <20091102185249.0da8e388@xxxxxxxxxxxxxxxxxxxx>
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On Montag 02 November 2009 Emmanuel Florac wrote:
> The 3Ware is so slow it's almost unusable without write cache. I bet
> he already uses it anyway.

Don't mix up the controller write cache vs. disk write cache. The 
controller write cache should be on whenever you have a BBM installed, 
because this brings real performance, while the disk write cache should 
always be off in a production environment, because you will loose data 
on power fail, which nobody can recognize (the controller believes the 
sectors to be written already...)

Hence my suggestion for turning on the disk write cache just to see if 
it makes a difference.

mfg zmi
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