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From: Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
To: Joshua D. Drake <jd@commandprompt.com>
Cc: jason@ohloh.net <jason@ohloh.net>
Cc: Geoff Tolley <geoff@polimetrix.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: SCSI vs SATA
Date: Wed, 04 Apr 2007 17:59:28 +0200
Message-ID: <4613CB60.6030505@kaltenbrunner.cc> (raw)
In-Reply-To: <4613C6F1.3090009@commandprompt.com>
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	<4613053F.5070401@polimetrix.com>
	<DF6C723E-7362-4173-8309-B8AAFC968E2C@ohloh.net>
	<4613C14A.4020703@commandprompt.com>
	<4613C54C.4050207@kaltenbrunner.cc>
	<4613C6F1.3090009@commandprompt.com>

Joshua D. Drake wrote:
> 
>>> SATAII brute forces itself through some of its performance, for 
>>> example 16MB write cache on each drive.
>>
>> sure but for any serious usage one either wants to disable that 
>> cache(and rely on tagged command queuing or how that is called in SATAII 
> 
> Why? Assuming we have a BBU, why would you turn off the cache?

the BBU is usually only protecting the memory of the (hardware) raid 
controller not the one in the drive ...


Stefan



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