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From: Joshua D. Drake <jd@commandprompt.com>
To: Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
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 08:40:33 -0700
Message-ID: <4613C6F1.3090009@commandprompt.com> (raw)
In-Reply-To: <4613C54C.4050207@kaltenbrunner.cc>
References: <9C0858F5-0A48-4AF9-80FF-E4BA14F0F965@ohloh.net>
	<E1HYs6Y-0008O5-SN@elasmtp-banded.atl.sa.earthlink.net>
	<E1HYsBX-0006ZE-JG@elasmtp-banded.atl.sa.earthlink.net>
	<4613053F.5070401@polimetrix.com>
	<DF6C723E-7362-4173-8309-B8AAFC968E2C@ohloh.net>
	<4613C14A.4020703@commandprompt.com>
	<4613C54C.4050207@kaltenbrunner.cc>


>> 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?

> world) or rely on the OS/raidcontroller implementing some sort of 
> FUA/write barrier feature(which linux for example only does in pretty 
> recent kernels)

Sincerely,

Joshua D. Drake

> 
> 
> Stefan
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend
> 


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