Date: Wed, 01 Nov 2000 17:04:25 -0800 From: Mike Smith <msmith@freebsd.org> To: "John R. LoVerso" <john@loverso.southborough.ma.us> Cc: freebsd-scsi@freebsd.org Subject: Re: iostat: tps for SCSI drives ... Message-ID: <200011020104.eA214Pe01438@mass.osd.bsdi.com> In-Reply-To: Your message of "Wed, 01 Nov 2000 16:57:46 EST." <200011012157.QAA91048@h201.infolibria.com>
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> This thread has made me wonder. I have a RAID-5 array connected to a DPT-5
> controller using the "asr" driver in 4.1.1-R, but it is not using tagged
> queueing. The DPT-5 does use tagged queueing on another disk on the same
> controller:
'asr' talks to the SCSI interface, but it doesn't behave quite the same
way. Commands don't have "tags" at all; they're queued at the controller
level and CAM doesn't have to do any tag management.
> Any idea why I don't see tagged queueing? Am I just confused (i.e., it
> shouldn't be enabled with a DPT-5 with a RAID-5)? Is I2O doing it under
> (and thus, transparent to) CAM?
You are confused, yes. 8)
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
V I C T O R Y N O T V E N G E A N C E
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