Date: Fri, 18 Sep 1998 11:07:40 +1000 (EST) From: Tony Maher <tonym@angis.usyd.edu.au> To: gibbs@narnia.plutotech.com Cc: current@FreeBSD.ORG Subject: Re: CAM this and that Message-ID: <199809180107.LAA25488@morgan.angis.su.OZ.AU>
next in thread | raw e-mail | index | archive | help
> I shouldn't lock up. What kind of tape device do you have? Were there > any console messages leading up to the hang? I'll try again over weekend to see if I can reproduce and send details then. >> change >> Queue Algorithm Modifier: 0 -> 1 > > Don't even think about doing this. If your other disks have this > turned on, you are begging for problems. Setting the Q.A.M to > 1 allows the drive to re-order transactions without regard to any > write integrity (i.e. write data to LBA X, read data to LBA X, read > is serviced before write and you get stale data). Ok thanks! I only modified the disk which doesn't report Tagged queueing to match what I saw on the other two. One of these disks was with the system when bought new, the other came off solaris box at work (it was flaky). I have never modified the scsi info and all the disks were installed using sysinstall. Is this how disks are configured from factory? Should I (everyone) check all disks installed? >> DQue: 1 -> 0 > > Having DQue as 1 will prevent us from attempting tagged queuing. You > would have to save this change and reboot for the system to notice this It was saved and rebooted but still didn't want to do tagged queuing. Will try again. >> (da2:ahc0:0:2:0): no longer in timeout, status = 34b >> ahc0: Issued Channel A Bus Reset. 17 SCBs aborted > > That really looks like a bogus cable or termination. The fact that > the problem seems to get better after boot (i.e the device warms up) > also points to a setup/connector problem. Termination is correct but the cable could be suspect. Will try a replacement. (This is old disk which was removed from work machines due to a couple of glitches. I have been using it at home without problem for about 12 months but under little load) Thanks again. tonym To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199809180107.LAA25488>