loki@NAZGUL.PHYSICS.MCGILL.CA (Loki Jorgenson Rm421) (04/21/91)
I suspect that I may have some sort of problem in my network. This feeling is based on two observations: 1) Sometimes, IRI acting as NFS disk servers are adversely affected by I/O intensive programs running on other IRI writing to disk; the nfsd consume most of the cpu time and write rates fall to kbyte/minute levels. 2) Collision rates on all IRI are between 2% and 10% of total in-bound and out-bound packets (compared to 0.2% on all SUN3s on the same net). These rates are according to "netstat -i". I would like suggestions as to what I should look for BESIDES cables of incorrect length and bad BNC connections. Also, if you have a comparable network arrangement (9 diskless SUN 3/50s served by a 3/180, a diskful 3/60, 3 4D/25, a 4D/20, a 4D/340 and 2 NeXT, all on thinnet; 3/180 is the gateway), please send me the results of a "netstat -i" for your IRI. Prehaps 5% collisions is normal. Also, is my understanding that Ethernet cables should be multiples of 50cm in length correct? Is there a minimum length? What is your opinion of a maximum length? I consider these sorts of numbers to be black magic and subject to context but I would like your experiences. I shall summarize if I get enough useful info. Thanks, __ __ Loki Jorgenson / / \ \ node: loki@Physics.McGill.CA Grad, Systems Manager / ////// \\\\\\ \ BITNET: PY29@MCGILLA Physics, McGill University \ \\\\\\ ////// / fax: (514) 398-8434 Montreal Quebec CANADA \_\ /_/ phone: (514) 398-7027