greg@duke.cs.unlv.edu (Greg Wohletz) (01/10/90)
In article <1444@jimi.cs.unlv.edu>, I write: > We have three microvax II's that we use as fileservers. Each has 3 > Wren V's and an Exabyte hooked into a Sigma scsi controller (it > emulates a uda and tms controller). They also have a Dec uda > controller hooked to an rd52 and two rx50's (yes we've had these > machines for a while...) on them. We have been running with this > configuration under Ultrix 2.0 without many problems (well a few nfs > bugs, but nothing major). Recently we got Ultrix 3.1. I installed it > on one of our microvax's and everything seemed to be going fine, I > could use the disks, and read from the Exabyte. However, when I tried > to dump the root filesystem to the Exabyte I got a write error, then > some message like ``mscp resynching controller uq2'' at that point the > system locked up. Well, I've investigated the situation a bit further, and I have discovered that (surprise, surprise) one difference between 2.0 and 3.1 is that all of the disk and tape drive stuff appears to have be re-written. Now everything (except for non-uda type drives and non-tmscp tapes) goes through this new mscp code (or at least that is what it looks like to me). Anyway looking at the code didn't reveal anything obvious, however I have noticed that I can't dump to the trusty (?) old rx50's. The first volume of the dump works fine, but if you so much as open the door to the floppy when dump asks you to insert the next volume all subsequent attempts to write to the floppy will fail (if you leave the same floppy in (without opening the drive door) for ALL of the volumes it will work...). I suspect that this problem is related to the same bug. I think at this point I'm almost convinced that it is a software bug, and not a problem with the Sigma controller, but I could be wrong. So the question is, will someone from DEC tell me if there is a known/fixable bug in 3.1 that would cause this behavior? Would if be possible to graft in the old tmscp code from 2.0 without an inordinate amount of pain? ANY information would be greatly appreciated. --Greg greg@unlv.edu <@relay.cs.net:greg@unlv.edu>