Re: SCSI vs SATA

From: Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
To: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
Cc: "jason(at)ohloh(dot)net" <jason(at)ohloh(dot)net>, Geoff Tolley <geoff(at)polimetrix(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: SCSI vs SATA
Date: 2007-04-04 15:59:28
Message-ID: 4613CB60.6030505@kaltenbrunner.cc
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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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