From owner-freebsd-scsi Sat Aug 16 22:51:32 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id WAA08142 for freebsd-scsi-outgoing; Sat, 16 Aug 1997 22:51:32 -0700 (PDT) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by hub.freebsd.org (8.8.5/8.8.5) with SMTP id WAA08128 for ; Sat, 16 Aug 1997 22:51:24 -0700 (PDT) Received: (from uucp@localhost) by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id HAA12848; Sun, 17 Aug 1997 07:51:23 +0200 Received: (from j@localhost) by uriah.heep.sax.de (8.8.7/8.8.5) id HAA18923; Sun, 17 Aug 1997 07:50:01 +0200 (MET DST) Message-ID: <19970817075001.XE28042@uriah.heep.sax.de> Date: Sun, 17 Aug 1997 07:50:01 +0200 From: j@uriah.heep.sax.de (J Wunsch) To: freebsd-scsi@FreeBSD.ORG (FreeBSD SCSI Mailing List) Cc: grog@lemis.com (Greg Lehey) Subject: Re: Bus resets. Grrrr. References: <199708170129.KAA03776@freebie.lemis.com> X-Mailer: Mutt 0.60_p2-3,5,8-9 Mime-Version: 1.0 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: <199708170129.KAA03776@freebie.lemis.com>; from Greg Lehey on Aug 17, 1997 10:59:43 +0930 Sender: owner-freebsd-scsi@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk As Greg Lehey wrote: > This is the third time in a row that I haven't been able to complete > a backup because of "recoverable" SCSI errors. What makes you think these are `recoverable'? Be reminded that this is the typical failure picture one can see from a bad SCSI chain. I'm also seeing it occasionally on our new Seagate/Conner DAT drive at work, where even the older ahc driver used to work with the previous HP DAT (that is dead now). I'm not fully sure yet, but i tend to blame the Conner drive there. > If I understand this correctly, this means that the abort SCB wasn't > received either, so the driver does a bus reset: Which is typical for a SCSI chain where ``Nichts geht mehr''. > Aug 17 10:27:32 freebie /kernel: sd1: UNIT ATTENTION asc:29,0 > Aug 17 10:27:32 freebie /kernel: sd1: Power on, reset, or bus device reset occurred That's the consequence from the bus reset. As you wrote, no harm done for the disks. The unit attention is typically caught by the first (out of 4) retries. > Is anybody doing anything about this? You, checking your termination and term power first? -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)