Date: Mon, 27 Mar 2000 23:51:33 -0500 (EST) From: Doug Ledford <dledford@redhat.com> To: Jeff Hill <jhill@hronline.com> Cc: AIC7xxx@FreeBSD.ORG Subject: Re: 2940U2W: Max. Number of Tagged Command Queries? Message-ID: <Pine.LNX.4.21.0003272350530.25324-100000@devserv.devel.redhat.com> In-Reply-To: <38E02876.873D4770@hronline.com>
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On Tue, 28 Mar 2000, Jeff Hill wrote:
> What is the maximum number of tagged command queries that Adaptec's
> 2940U2W supports?
255 per controller.
> I've asked Adaptec (no response) and searched the AIC7xxx archives and
> other places with no luck.
>
> As I understand it, in part the answer depends on the peripherals
> attached, but I have only attache two identical Seagate U2W Cheetah
> drives via a short, internal LVD/SE cable supplied with the kit. The
> Seagate drives support 64 TCQs, as I read their tech manuals.
64 is overkill and will likely just slow the machine down. I wouldn't go
any more than 32 per drive.
--
Doug Ledford <dledford@redhat.com>
Opinions expressed are my own, but
they should be everybody's.
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