Date: Sun, 1 Nov 1998 19:29:08 +1030 From: Greg Lehey <grog@lemis.com> To: "Kenneth D. Merry" <ken@plutotech.com>, "John W. DeBoskey" <jwd@unx.sas.com> Cc: freebsd-current@FreeBSD.ORG Subject: Re: scsi disk (cam?) problems Message-ID: <19981101192908.D19187@freebie.lemis.com> In-Reply-To: <199811010208.TAA27408@panzer.plutotech.com>; from Kenneth D. Merry on Sat, Oct 31, 1998 at 07:08:50PM -0700 References: <199811010132.UAA04810@bb01f39.unx.sas.com> <199811010208.TAA27408@panzer.plutotech.com>
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On Saturday, 31 October 1998 at 19:08:50 -0700, Kenneth D. Merry wrote: > John W. DeBoskey wrote... >> Hi, >> >> My -CURRENT system has been experiencing problems since I converted >> it to cam awhile back. The following show up on my console, and then >> my disks are useless until I completely shutdown, powerdown my drive >> array, power it back on, and reboot. I have 4 identical drives configured >> as a ccd. They have been serving me well more about a year... >> >> If anyone has any ideas on how I can track down the problem, please >> let me know! >> >> Thanks, >> John >> >> /dev/ccd0a 2155550 1268428 714678 64% /snap >> /dev/ccd0b 2155550 1020154 962952 51% /usr/obj >> /dev/ccd0d 17244630 12876242 2988818 81% /pub >> >> Snipped from messages: (This kernel was built on the 28th), I'm now on >> a kernel built Oct 31. > [ ... ] > >> Oct 30 10:52:35 FreeBSD /kernel: (da2:ahc0:0:3:0): Invalidating pack >> Oct 30 10:52:35 FreeBSD /kernel: (da2:ahc0:0:3:0): Invalidating pack > > Well, what's happening here is that one of your disks is returning an > error, and keeps returning that error. Reads and writes in the da driver > have a retry count of 4. So by the time we print out the message above, > the command has already been retried four times. We may also have taken a > number of error recovery actions to try to bring the device back. > > Because your disk is in a CCD array, though, you won't be able to access > the CCD array when one disk in the array is marked as invalid. > > For some reason, though, the sense information for the error in question > isn't getting printed out. It may be that there's a bug in the sense code > table somewhere. > > How often does this happen? FWIW, I can reproduce this message (and usually lack of sense information) at will by pulling a data connector during a transfer (why? I'm testing Vinum, which *can* recover from this situation :-). Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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