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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!simtel!news.kei.com!news.mathworks.com!newsfeed.internetmci.com!news.sprintlink.net!howland.reston.ans.net!news.nic.surfnet.nl!sun4nl!news.euro.net!news From: gary@kampai.euronet.nl Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: SCSI Timeout with Adaptec 2940 and DAT drive - Help! Date: 20 Aug 1995 11:48:22 GMT Organization: Euronet Internet Lines: 49 Message-ID: <4177e6$2qo@news.euro.net> References: <408m4r$7vu@news.euro.net> <40vffs$mdc@wup-gate.wup.de> <412l7r$2ilp@janus.la.locus.com> Reply-To: gary@kampai.euronet.nl NNTP-Posting-Host: kampai.euronet.nl X-Newsreader: IBM NewsReader/2 v1.2 In <412l7r$2ilp@janus.la.locus.com>, fmayhar@janus.la.locus.com (Frank Mayhar) writes: >In article <40vffs$mdc@wup-gate.wup.de>, Andreas Klemm <andreas@wup.de> wrote: >>gary@kampai.euronet.nl wrote: >>: I've been having problems restoring DAT backups on my system. >>: I'm running an Adaptec 2940 with a SCSI disk, HP DAT, and a CDROM. >>: The setup works fine under windoze. I've checked all cables, and >>: disconnected the CDROM, but still I keep getting SCSI timeouts >>: which cause my system to hang. The installation worked fine from >>: DAT. >>All devices internal or some externel ? >>Which cable, how long ? Suitable for Fast SCSI II ? >>What about Termination ? Really correctly terminated ? Only both ends ? >>Parity enabled or not ? If enabled, then on all devices. >>What about Controller settings ? Synchr. negotiation 'yes' or 'no' >>for all devices. I'd try 'no' if there are problems. >>What about the machines BIOS settings ? TUNED like hell or not ? >>Try standard values ... > >I've seen something like this once, myself. I have an external Archive >Viper 2150S drive, I was using a 250-meg tape, and tried to do an fsf 2. >The first filemark was very far down the tape, and the driver eventually >timed out the operation, subsequent to which point sd0 and sd1 were timed >out (despite not being associated with the operation) and the SCSI bus >hung. I had to hard-reset (yukko!) the box to fix things. > >I'm using a 2940W. Cabling is a 50-pin ribbon to three drives internal to >the main box, culminating in a 50-pin Centronics connector to which is >connected a standard, fairly good-quality shielded external cable to an >old Sun shoebox with new cabling, that contains the tape drive. The daisy >chain ends on the out side of the shoebox in active termination. > >I really don't think it's a problem with the cabling, I think that the >problems after the initial timeout are due to bugs in the driver itself. >Needless to say, I won't be doing any more fsf operations. >-- >Frank Mayhar fmayhar@locus.com I'm 100% sure the problem is not due to cabling, termination etc., since the DAT works well under windoze. I've recently added a second adapter (an Adaptec 1542) to be used solely by the DAT drive, and my kernel panic problems have disappeared, confirming that there is some sort of problem with the Adaptec PCI driver. However, I'm still getting an occaisional timeout on the console, and pax prompts me for the "next device" whilst in the middle of a restore (I hit 'y' and things seem to go OK). Gary