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Newsgroups: comp.unix.bsd.freebsd.misc Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!munnari.OZ.AU!news.ecn.uoknor.edu!paladin.american.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!ka.sub.net!flatlin!bad From: bad@flatlin.ka.sub.org (Christoph Badura) Subject: Re: SCSI problems performing writes to FAST SCSI-2 drives Date: Thu, 15 Feb 1996 19:35:21 GMT Message-ID: <DMu12y.ApB@flatlin.ka.sub.org> References: <4fqnbb$f7v@viking.ucsalf.ac.uk> <4fr9rr$t4i@atlas.uniserve.com> Organization: Guru Systems/Funware Department Lines: 37 In <4fr9rr$t4i@atlas.uniserve.com> tom@uniserve.com (Tom Samplonius) writes: >In article <4fqnbb$f7v@viking.ucsalf.ac.uk>, mark@ucsalf.ac.uk says... >>The write falls over with the following on VTY2: >> >>ahc_scsi_cmd0: more than 256 DMA segs ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >>sd0: oops not queued >>biodone: buffer already done >>init died (signal 0, exit 1) >> >>I have been occasionally to get past the partition write, but it mentions it >>can't mount swap and then fails to make the filesystems. >>This also happens with an IBM DFHS S2F 2Gb FAST SCSI-2 drive. It happens with >>a 1542C, 1542CF, AHA 2940 controller and on two different machines 100MHz >>Pentium and non PCI DX2 66MHz. Same problem, but different number of DMA segs on the >>1542 (less SCB's??.) With a DEC DSP5200S 2Gb SCSI-2 (not FAST) I have no problems >>at all on either machine with any SCSI adapter. I'd really like a FAST drive though. >>Any ideas what this could be? > Termination? Cable? No. The drivers are complaining that they need more scatter-gather segments for the operation then fit in a single CCB. Yes, the 1542 doesn't support as many scatter-gather segments as the 2940. I the ahc driver thinks it needs more then 256 segments for a single request is beyond me, though. That would mean you are handling it a > 1MB (256 * 4KB per page) request, which is a bit to large for a partition table. -- Christoph Badura bad@flatlin.ka.sub.org You don't need to quote my .signature. Everyone has seen it by now. Besides, it doesn't add anything to the current thread.