Date: Tue, 31 Oct 2000 09:13:52 -0800 (PST) From: Tom Samplonius <tom@sdf.com> To: "Marc G. Fournier" <scrappy@hub.org> Cc: freebsd-scsi@freebsd.org Subject: Re: iostat: tps for SCSI drives ... Message-ID: <Pine.BSF.4.05.10010310908560.24950-100000@misery.sdf.com> In-Reply-To: <Pine.BSF.4.21.0010311046500.67007-100000@hub.org>
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On Tue, 31 Oct 2000, Marc G. Fournier wrote:
> morning all ...
>
> what is considered to be a 'saturated drive', as far as tps is
> concerned? I have a database server that I found one drive to be overused
> with another not used at all, so I started moving around databases to
> balance off the load a bit ... which helped alot. But am wondering if
> there is an "acceptable tps level" for a drive before you should look at
> moving things around ?
Well, if you assume that each transfer requires a seek, and you know the
average seek time of your drive, you'll be about to figure out the number
of transfers per second your drive can do (assuming each transfer requires
a seek). If you are using SCSI drives with tagged command queues, you can
use camcontrol to see how many pending commands there are.
> Marc G. Fournier scrappy@hub.org
> Systems Administrator @ hub.org
> scrappy@{postgresql|isc}.org ICQ#7615664
Tom
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