[7996] in linux-scsi channel archive
Problems with an Adaptec 2940U2W
daemon@ATHENA.MIT.EDU (t3kno@pacbell.net)
Thu Feb 3 02:53:21 2000
Date: Wed, 02 Feb 2000 15:48:31 -0800
From: t3kno@pacbell.net
To: linux-scsi@vger.rutgers.edu
Message-id: <3898C24F.96734221@pacbell.net>
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Hello,
I hope someone can help me with a problem that I am having with my
Adaptec 2940U2W LVD controller. For some reason the drives are only
transfering at 40.0MB/s. I am also having problems mounting CD's, and I
think this is the cause of some random lockups. Also, occasionally the
computer will completely stop responding for about 30 seconds, come back
to life for about 10-15 seconds and then stop responding again and then
as suddenly as the symptoms start they go away sometimes after about 10
minutes sometimes after an hour or more.
Currently I am running kernel 2.2.14 with the driver for the card
compiled into the kernel, but I have experienced this problem with
kernels 2.2.10 all the way up, with the driver as both a module and
compiled directly in. The SCSI chain looks like this, the controller
has two connectors, one LVD and one normal, on the LVD chain I have two
Western Digital Enterprise drives, on ID 0 the drive is a 10K 18.31GB,
and ID 2 is a 7200 18.3GB followed by an active terminator (the cable is
a teflon LVD cable) on the second connector I have connected two CDRom
Drives, one is a Sony Spressa 4X Burner, and the other is a NEC CD Rom.
The CDROMS are ID's 4 and 6 respectively. I have also tried running the
CDRoms on a seperate 2940UW controller, but the drives always report
40.0MB/s. In the BIOS most of the settings are at the default and the
drives are set for 80.0 MB/s transfer rate. I have been looking at the
scsiinfo and scsi-config programs to see if I can find out what the
problem is, and I have noticed a couple of things that dont seem right
(forgive me I'm not really familiar with SCSI). The first thing that
catches my eye is that the Wide Bus 32 is 0 and Wide Bus 16 is 1 for
both /dev/sda and sdb in the Inquiry command portion of scsiinfo,
scsi-config reports the same. Synchronous neg., Linked Commands and
Command Queuing are all 1 as well. The other thing that bothers me is
that there are a lot of Entries on the Data from Defects list for both
drives, 8168 entries for the 10k drive and 404 for the 7200. I have no
idea what these defects are, or if they are even bad, but I thought it
was worth a mention.
I have looked at a lot of documentation, but I cant find anywhere how to
force the transfer rates or negoation. I'm thinking that there may be
some command that I need to pass to LILO at boot time, but that is just
a guess. The controller has the latest BIOS, and for the most part
linux is running really well on these drives. I think there are some
subtle problems that are arising from this though and I would like to
get it worked out. Thank you very much in advance for you help and I am
eager to provide any more information that may be needed. Thanks again,
Dave
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