[8226] in linux-scsi channel archive
Re: recovery behaviour with 1 bad + 1 good drive (aic7xxx)
daemon@ATHENA.MIT.EDU (Doug Ledford)
Fri Feb 25 01:20:15 2000
Message-ID: <38B59104.8C747119@redhat.com>
Date: Thu, 24 Feb 2000 15:13:56 -0500
From: Doug Ledford <dledford@redhat.com>
MIME-Version: 1.0
To: Ricky Beam <jfbeam@bluetopia.net>
Cc: linux-scsi@vger.rutgers.edu
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Ricky Beam wrote:
>
> On Thu, 24 Feb 2000, Doug Ledford wrote:
> >> That list already exists (sortof) There's a list of drives with whom
> >> drivers should not probe LUNs or attempt tagged queuing. I messed with it
> >> once to allow queuing on my Jaz drive -- it was blcklisted but works just
> >> fine. (only a few firmware versions have a problem; it's safer to always
> >> say NO!)
> >
> >More than a few versions of Jaz drive have that bug, everything with a
> >firmware version J.86 or earlier has that bug.
>
> Yep. But the blist doesn't check the revision (or didn't) thus all jaz
> drives end up with tag queuing disabled -- that's certainly the safe thing
> to do. I hate the speed degradation... <grin>
>
> Checking my machines:
> (jakolantronic/alpha) Vendor: iomega Model: jaz 1GB Rev: G.72
> (dominion/x86) Vendor: iomega Model: jaz 1GB Rev: J^77
> (foobar/x86) Vendor: iomega Model: jaz 1GB Rev: J.83
>
> All of those have an active queue depth of 8 and work perfectly. I have
> a few other jaz drives not in an machines so I don't know their revisions,
> but they work fine with a queue depth of 8 as well.
Are you sure tagged queueing is actually being used on those drives? They
should all be defective according to my information. I would be curious to
know just how sure you are that these drives are using tagged queueing.
--
Doug Ledford <dledford@redhat.com> http://people.redhat.com/dledford
Please check my web site for aic7xxx updates/answers before
e-mailing me about problems
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