Date: Wed, 1 Nov 2000 18:43:55 -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.4.21.0011011840510.494-100000@thelab.hub.org> In-Reply-To: <200011010510.eA15Aja05833@aslan.scsiguy.com>
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On Tue, 31 Oct 2000, Justin T. Gibbs wrote: > > > >On Tue, 31 Oct 2000, The Hermit Hacker wrote: > > > >> Okay, how do I read this: > >> > >> pgsql# camcontrol tags da0 -v > >> (pass0:ahc0:0:0:0): dev_openings 41 > >> (pass0:ahc0:0:0:0): dev_active 0 > >> (pass0:ahc0:0:0:0): devq_openings 41 > >> (pass0:ahc0:0:0:0): devq_queued 0 > >> (pass0:ahc0:0:0:0): held 0 > >> (pass0:ahc0:0:0:0): mintags 2 > >> (pass0:ahc0:0:0:0): maxtags 255 > > > > I wonder why dev_openings is lower than maxtags? > > Maxtags is the limit imposed by the quirk entry matching the device. Okay, under what conditions would dev_openings == maxtags? My best drive that I can find on my various machines is a brand new LVD drive: da0 at ahc0 bus 0 target 0 lun 0 da0: <QUANTUM ATLAS_V__9_WLS 0230> Fixed Direct Access SCSI-3 device da0: 160.000MB/s transfers (80.000MHz, offset 63, 16bit), Tagged Queueing Enabled da0: 8755MB (17930694 512 byte sectors: 255H 63S/T 1116C) mailserv# camcontrol tags da0 -v (pass0:ahc0:0:0:0): dev_openings 64 (pass0:ahc0:0:0:0): dev_active 0 (pass0:ahc0:0:0:0): devq_openings 64 (pass0:ahc0:0:0:0): devq_queued 0 (pass0:ahc0:0:0:0): held 0 (pass0:ahc0:0:0:0): mintags 2 (pass0:ahc0:0:0:0): maxtags 255 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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