Date: Thu, 2 Nov 2000 20:51:14 -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.4.21.0011022049320.494-100000@thelab.hub.org> In-Reply-To: <200011030020.eA30KFa90886@aslan.scsiguy.com>
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On Thu, 2 Nov 2000, Justin T. Gibbs wrote: > >So, what exactly does supporting 64, or 128, tags on a drive > >provide? > > Since modern drives perform seek optimization and command coalescing, > it will usually result in fewer or shorter seeks and thus better > throughput. How "smart" is it? In a multi-user system, I imagine that Cmd0->Cmd5 could be for information that UserA needs, while Cmd6->Cmd7 is for something UserB needs ... 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? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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