Date: Wed, 22 Dec 1999 21:13:30 +0100 From: Wilko Bulte <wilko@yedi.iaf.nl> To: Greg Lehey <grog@lemis.com> Cc: Matthew Dillon <dillon@apollo.backplane.com>, Peter Jeremy <peter.jeremy@alcatel.com.au>, FreeBSD current users <FreeBSD-current@FreeBSD.ORG> Subject: Re: DLTs, disconnection and hangs--solved (was: Recent current hangs frequently for 1 to 2 seconds.) Message-ID: <19991222211330.E833@yedi.iaf.nl> In-Reply-To: <19991222093755.A60684@freebie.lemis.com>; from grog@lemis.com on Wed, Dec 22, 1999 at 09:37:55AM %2B1030 References: <19991221100727.A52224@yedi.iaf.nl> <19991219143759.C465@freebie.lemis.com> <199912190416.UAA01125@apollo.backplane.com> <19991221095213.L440@freebie.lemis.com> <199912210019.QAA62510@apollo.backplane.com> <19991221110148.N440@freebie.lemis.com> <199912210108.RAA62736@apollo.backplane.com> <99Dec21.123129est.40326@border.alcanet.com.au> <199912212004.MAA80595@apollo.backplane.com> <19991222093755.A60684@freebie.lemis.com>
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On Wed, Dec 22, 1999 at 09:37:55AM +1030, Greg Lehey wrote:
> On Tuesday, 21 December 1999 at 10:07:28 +0100, Wilko Bulte wrote:
> > On Mon, Dec 20, 1999 at 05:08:27PM -0800, Matthew Dillon wrote:
> >>> It's possible you might be on to something. I've been running iostat
> >>> at 1 second intervals, and during the last hang I saw:
> >> * Not properly terminate the SCSI bus (especially when mixing
> >> bus architectures. For example, a tape drive may only
> >> half-terminate a wide SCSI bus. Never use a tape drive to
> >> terminate a SCSI bus, not even an older SCSI bus.
> >
> > As has been discussed many times already: use external terminators attached
> > to the cable. SCSI termination is not difficult, it is just made that way
> > by some :(
>
> Who said this?
>
> There is nothing magic about SCSI cabling. There are sound
> technical reasons why they occasionally require the sacrifice of a
> young goat.
Not me, but it sounds familiar. But really: using good stuff to start with
saves you a lot heartburn down the road.
> > A more interesting question would be if the DLT drive has a more or less
> > recent firmware loaded.
>
> The discussion's worthwhile, but remember that I have had this when
> the DLT wasn't running as well. How do I find the firmware release?
> Is that the supplementary information (CC1E) in the dmesg output?
Yep. CC1E breaks down into:
0xCC = drive revision = servo code = 204
0x1E = scsi/r\w code = 30
Obviously the last byte is the more interesting one.
> sa1 at ahc0 bus 0 target 3 lun 0
> sa1: <Quantum DLT4000 CC1E> Removable Sequential Access SCSI-2 device
> sa1: 10.000MB/s transfers (10.000MHz, offset 15)
Mine is:
sa2: <DEC TZ88 (C) DEC D473> Removable Sequential Access SCSI-2 device
I'm not sure if the DEC f/w revs correlate 1:1 with Quantum revs though.
(NB TZ88 == DLT4000)
W/
--
Wilko Bulte Arnhem, The Netherlands - The FreeBSD Project
WWW : http://www.tcja.nl http://www.freebsd.org
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