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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Subject: Re: IBM blade server abysmal disk write performances
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Cc: Karim Fodil-Lemelin <fodillemlinkarim@gmail.com>,
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> to be enabled to get any speed-up from tagged commands. This was no
> risk with SCSI drives, since the cache did not make the drives lye

i see no correlation between interface type and possibility of lying about 
command completion.