Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uwm.edu!ux1.cso.uiuc.edu!ux1.cso.uiuc.edu!tundra From: tundra@ux1.cso.uiuc.edu Newsgroups: comp.sys.dec Subject: Re: Decnet Drops Connect (?) Message-ID: <16500003@ux1.cso.uiuc.edu> Date: 3 Aug 90 17:10:00 GMT References: <184519@<1990Aug2> Lines: 49 Nf-ID: #R:<1990Aug2:184519:ux1.cso.uiuc.edu:16500003:000:2325 Nf-From: ux1.cso.uiuc.edu!tundra Aug 3 12:10:00 1990 In case they are of any interest, here is a summary of the responses I received on the LOST CONNECTION problem so far. Thanks to everyone for the suggestions. You would have to read a lot of manuals and have a very sharp eye to come up with such good ideas. I have run sys$system:dtsend tests. I am currently trying the RECNEXINTERVAL parameter increase and looking at various memory and io parameters. Only time will tell if these changes are successful. Thanks again, -------- john kemp ( ( )_ internet - kemp@uiatma.atmos.uiuc.edu ----- ( ( __) decnet - uiatmb::kemp --- univ of illinois (_ ( __) bitnet - {uunet,convex} -- dept of atmos sci .(____). !uiucuxc!uiatma!kemp - 105 s gregory ave ... phone - (217) 333-6881 - urbana, il 61801 ... fax - (217) 444-4393 From: "Carl Karcher, Room 535 WC, 3-5896" Subject: Re: Decnet Drops Connect (?) The network is flakey. What the messages mean is SCS communications (not decnet) has been lost and then restored in less than 20 seconds (if sysgen parameter recnexinterval is at the default). Cluster traffic (ala SCS) is far more sensitive to network problems that decnet. If the network disturbance lasts longer than 20 seconds things will crash. I would increase recnexinterval (say to 1 minute) until your network problems are solved. This is a dynamic parameter so it can be done online (.e.g using SYSMAN commands PAR SET then PAR WRITE ACTIVE commands). In a large network its a good idea to increase recnexinterval permanently. Otherwise one misconnected PC can crash your LAVC. Carl Karcher Internet: KARCHER@WAISMAN.WISC.EDU University of Wisconsin-Waisman Center Bitnet: KARCHER@WISCPSL Madison, Wisconsin, USA PSTnet: (608) 263-5896 Subject: Decnet Drops Connect (?) Sender: Craig Paul Reply-To: paul@kuhub.cc.ukans.edu What does dtsend tell you about line utilization? If you get less than 6% line utilization you've probably got physical line problems. Since your explanation makes these two nodes sounds as though it is your entire network I'd expect line utilizations in the 10s of percents, at least!