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From: mcnab@bayarea.net (David McNab)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: ncr.c: extraneous data discarded
Date: 25 Jun 1996 21:00:42 GMT
Organization: Bay Area Internet Solutions (408)447-8690
Lines: 26
Message-ID: <4qpk1q$le6@pier2.bayarea.net>
NNTP-Posting-Host: baygate.bayarea.net
X-Newsreader: TIN [version 1.2 PL2]
I installed a second Fujitsu fast SCSI-2 disk
drive on my P100 FreeBSD machine last week. Yesterday
I finally got around to chopping it up into partitions,
labelling it, and so on. I then set 'tar' a-copying
my home directory to a nice roomy new partition on the
new drive. Everything seemed to work fine, but later
when I was shutting down the machine I saw some errors
on the console that disturbed me:
Jun 24 13:13:05 mcnab /kernel: sd0(ncr0:0:0): extraneous data discarded.
Jun 24 13:13:11 mcnab /kernel: sd1(ncr0:3:0): extraneous data discarded.
ncr.c is the source of the message. The error
code that generates the message comes from the xerr_status
field of the ccb and is #define'd as "XE_EXTRA_DATA",
which is tagged with the comment "unexpected data phase".
Unfortunately I don't know enough about SCSI or
the NCR adaptor to know whether this is a minor timing
glitch or a real problem. It does not appear that any
data was lost or mangled, so I'm not particularly worried.
But I am curious.
Can anyone out there explain why this is happening?
-- Dave McNab