From owner-freebsd-scsi Sat Aug 16 23:06:05 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id XAA09244 for freebsd-scsi-outgoing; Sat, 16 Aug 1997 23:06:05 -0700 (PDT) Received: from iworks.InterWorks.org (deischen@iworks.interworks.org [128.255.18.10]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id XAA09228 for ; Sat, 16 Aug 1997 23:06:01 -0700 (PDT) Received: (from deischen@localhost) by iworks.InterWorks.org (8.7.5/) id AAA17585; Sun, 17 Aug 1997 00:30:14 -0500 (CDT) Message-Id: <199708170530.AAA17585@iworks.InterWorks.org> Date: Sun, 17 Aug 1997 00:30:14 -0500 (CDT) From: "Daniel M. Eischen" To: freebsd-scsi@FreeBSD.ORG, grog@lemis.com Subject: Re: Bus resets. Grrrr. Sender: owner-freebsd-scsi@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk > This is the third time in a row that I haven't been able to complete a backup > because of "recoverable" SCSI errors. Here's a pretty typical scenario: > > IGI == 0x0 > > What does this mean? What can time out when nothing's happening? Or is this a > timeout accepting a new command when it shouldn't have to? Is this a device or > a driver logic error? I think you're missing a few character. It should probably read SCSISIGI = 0x0, which means the SCSI Control Signal Register was thinks it's in a Data Out phase. [...] > but the tape dies. Is there a good reason for this? I would have thought that > it would make sense for a power on or reset, but not for a bus reset. Does a > tape unit lose its position or data when it receives a bus reset? I get this also when doing backups on my HP C1533 with tapes that are older/bad. The drive seems to retension itself, or something similar, during the middle of accessing it. Using a newer tape doesn't exhibit the same problem. Usually, my system will lock up when this happens. This is under 3.0-current, though I haven't tried since Justin committed the spin-lock fix to the sequencer. Dan Eischen deischen@iworks.InterWorks.org