Date: Fri, 3 Nov 2000 11:27:34 -0400 (AST) From: The Hermit Hacker <scrappy@hub.org> To: "Justin T. Gibbs" <gibbs@scsiguy.com> Cc: Tom Samplonius <tom@sdf.com>, freebsd-scsi@FreeBSD.ORG Subject: Re: iostat: tps for SCSI drives ... Message-ID: <Pine.BSF.4.21.0011031127130.494-100000@thelab.hub.org> In-Reply-To: <200011030519.eA35Jma93066@aslan.scsiguy.com>
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Cool ... thanks all for the patience and explanations ...
On Thu, 2 Nov 2000, Justin T. Gibbs wrote:
> >I imagine this would have to be "on the drive", but can they feed back
> >information for Cmd6->Cmd7 while its processing Cmd0->Cmd5? Or is it
> >purely FIFO?
>
> That is exactly the point. The drive does not have to handle the
> transactions in FIFO order unless you specificly tell it to. You
> can do this on a per-command basis: re-order any way that is convenient,
> ensure all transactions queued prior to this command complete prior to
> its execution, or place this transaction at the head of the queue.
>
> --
> Justin
>
>
Marc G. Fournier ICQ#7615664 IRC Nick: Scrappy
Systems Administrator @ hub.org
primary: scrappy@hub.org secondary: scrappy@{freebsd|postgresql}.org
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