From owner-freebsd-current Wed Dec 22 12:24:49 1999 Delivered-To: freebsd-current@freebsd.org Received: from uni4nn.gn.iaf.nl (osmium.gn.iaf.nl [193.67.144.12]) by hub.freebsd.org (Postfix) with ESMTP id 406B6155EE for ; Wed, 22 Dec 1999 12:24:46 -0800 (PST) (envelope-from wilko@yedi.iaf.nl) Received: from yedi.iaf.nl (uucp@localhost) by uni4nn.gn.iaf.nl (8.9.2/8.9.2) with UUCP id UAA06569; Wed, 22 Dec 1999 20:29:23 +0100 (MET) Received: (from wilko@localhost) by yedi.iaf.nl (8.9.3/8.9.3) id VAA01466; Wed, 22 Dec 1999 21:13:30 +0100 (CET) (envelope-from wilko) Date: Wed, 22 Dec 1999 21:13:30 +0100 From: Wilko Bulte To: Greg Lehey Cc: Matthew Dillon , Peter Jeremy , FreeBSD current users Subject: Re: DLTs, disconnection and hangs--solved (was: Recent current hangs frequently for 1 to 2 seconds.) Message-ID: <19991222211330.E833@yedi.iaf.nl> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <19991222093755.A60684@freebie.lemis.com>; from grog@lemis.com on Wed, Dec 22, 1999 at 09:37:55AM +1030 X-OS: FreeBSD yedi.iaf.nl 3.3-STABLE FreeBSD 3.3-STABLE X-PGP: finger wilko@freebsd.org Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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: Removable Sequential Access SCSI-2 device > sa1: 10.000MB/s transfers (10.000MHz, offset 15) Mine is: sa2: 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message