cetron%utah-cbd@UTAH-CS.ARPA.UUCP (06/10/86)
I recently brought up uVMS 4.4 with no apparent trouble on my MVII. All seems well except the DECnet keeps going up and down every 7-12 minutes....messages like: DECnet event 4.7, circuit down, circuit fault ... Circuit QNA-0, Line synchronization lost DECnet event 4.10, circuit up ... Circuit QNA-0 and this repeats roughly 4-6 times and then stays up for 7-12 minutes.... over the weekend I produced 120 pages of OPCOM messages....I have since turned off monitor logging of events 4.7 and 4.10 and the system seems more robust (it stays up 10-15 minutes now).... The afflicted MVII connects into a DELNI with another MVII running 4.2, an 11/44 running RSX-11M+ DECnet, an 11/73 MINC running RSX-11M+ DECnet as well as a 750 and an HP bobcat running TCP/IP. Then DELNI then connects into a larger TCP/IP speaking ethernet... None of the UNIBUS machines show any line synchronization problems. The 11/73 MINC (with a DEQNA) shows no problems. The other MVII running uVMS 4.2 shows roughly 2-4 cycles per day of this same pattern. Has anyone else noticed this problem? Is it hardware? or the new 4.4? -ed cetron%utah-cbd@utah-cs.arpa
dolson@USC-ISIF.ARPA.UUCP (06/11/86)
ed- I had a similar problem with circuit drop/reappearances when I first set up our ethernet just a few months ago. I was taking a single 11/785 to a two-node (both 11/785s) VAXCluster. With no ether experience we were trying to bring up DECSA terminal servers (which get their load software from any host-designated VAX on the ether), the DEUNAs on the VAXen, and interconnecting these boxes with a DELNI. As you experienced, we saw circuit yo-yos which made absolutely no sense. At times things were so confused that the DEUNA on the first 785 looked like it had completely died; NCP> was reporting hard controller errors, etc, which didn't go away until rebooting. What was getting us was the DELNI. It has 8 ports, right? logically equivalent, right? Evidently not electrically. If you aren't using all 8 ports, start your connections at port 1 (nearest the special DELNI-DELNI port) and use them sequentially. I only counted 7 connections in your message so if your vacant DELNI port isn't number 8, maybe it should be. That cleared our problems up. And trying it should only take a minute or two. Doug (dolson @ Ada20.arpa) -------
rick@NGP.UTEXAS.EDU (Rick Watson) (06/12/86)
DEQNA's have some kind of problem with collisions which make them almost unusable on an ethernet that is any more than very lightly loaded. There is an ECO due out now to cure the problem. My field service rep told me that he hoped to be able to order it soon. You may have to badger them a bit to find out much about it as it (the ECO) is still in the process of being released. Rick Watson University of Texas Computation Center arpa: rick@ngp.UTEXAS.EDU rick@ngp.ARPA uucp: ...seismo!ut-sally!ut-ngp!rick rick@ut-ngp.UUCP bitnet: ccaw001@utadnx phone: 512/471-3241