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From: bloyall@widomaker.com (Ben Loyall)
Newsgroups: comp.unix.bsd.freebsd.misc,comp.periphs.scsi
Subject: SCSI-2 Bus Hangs
Date: 24 Dec 1995 11:12:41 -0500
Organization: Widomaker Public Access Internet (804)221-8070
Lines: 38
Message-ID: <4bju5p$ihj@wilma.widomaker.com>
NNTP-Posting-Host: wilma.widomaker.com
Summary: Try to solve SCSI-2 bus hangs
Keywords: SCSI-2 Lockup
Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:11375 comp.periphs.scsi:43758
I have a Usenet server that keeps locking up. When it locks, the SCSI-2
disk in question will have its access light light solidly. The rest of
the machine is still running, but nothing can access the disk.
Eventually, all process block waiting on i/o and the machine is dead.
A complete power down is the only cure. This used to happen on average
every 7 days when the drive was controlled by an AHA-1742/I486dx2 combo.
But since going to NCR-8510/IP100, It is usually once every 24 hours.
The only thing I can attribute that to is the speed increase.
As the disk in question is a newspool on a rather busy newsbox, it gets a
good workout.
The problem has plauged me for at least 9 months. I had always thought
it was a bum hdd. However, the drive in question (Seagate Baracudda 2GB)
was removed this week and a Conner 4.2GB was put in its place. This
morning I found the machine in the same locked state.
I have seen this problem under 4 OSes (Unixware 1.1.3, RH Linux, FreeBSD
2.0.5 & FreeBSD 2.1). It has happened on 2 different motherboard/cpu sets
(Micronics 486-EISA w/486-DX2 & lately, SiS MTI-R526 w/P-100). Also
observed on the following controllers: AHA-1742 (Enhanced only) & and
NCR 8510 based PCI card.
The bus has 4 devices on it. id0=Seagate ST1480N (406MB SCSI-2),
id1=Maxtor 7213S (202MB SCSI-1), id2=Maxtor 7345S (329MB SCSI-1),
id3=Conner CFP4207S (4.2GB Fast SCSI-2).
id0 is at the far end of the bus and is terminated & the controller is
properly terminated. The other devices have their terminators removed.
Any help on this would be greatly appreciated.
--
Ben Loyall | (804) 221-8070 28.8 & down
Widomaker Public Access Internet | Unix shell for 60 hours/month, $20
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