doug@herbert.uucp (Doug Phillipson 5-0134) (01/14/90)
Running SUNOS 4.0.3 ----- ---- --- --- ---- ----- | |___| |___| | | |___| |___| | | | | | | | TELCO | | | | | | ----- ---- --- --- ---- ----- Sun4 Bridge Modem Modem Bridge SUN4 The bridges are Advanced Computer Communications Model# ACS4030, the modems are NEC 9631 running in synchronous mode at 9600. The problem: When transfering a file between the SUNS (or any other host). The throughput gradually decreases over time. I.E transferring a one meg file starts out good then in a little while the modem activity decreases and I start getting "NFS host not responding" messages (if using cp with a mounted file system). Or if using rcp the through put just goes to heck. I have noticed that if lots of requests are traversing the bridges (lots of separate rcp's or cp's on a mounted NFS) the throughput stays good. Its as if the bridges like lots of parallel traffic. Then when most of the rcp's are done the traffic trails off again and the one or two unfinished copy commands go to crap. Has anyone seen this problem? Generally these bridges work well but this confuses me. Douglas Phillipson (EG&G)
donegan@stanton.UUCP (Steven P. Donegan) (01/15/90)
In article <1990Jan13.230551.6884@herbert.uucp>, doug@herbert.uucp (Doug Phillipson 5-0134) writes: > > When transfering a file between the SUNS (or any other host). > The throughput gradually decreases over time. > > Douglas Phillipson (EG&G) Doug, I would connect a terminal to the console port on the rear of the unit on the source side (where the file(s) are coming from), and set up the monitor modes to performance and error modes. The things to look for are re-transmits on the link side(probably not your problem here) and multilink q's filling up (which probably is your problem). 9600 baud is really slow for what you are attempting to do - I always spec a 56k/64k DDS type link for this type of connection. -- Steven P. Donegan (stanton!donegan) Area Telecommunications Engineer Corporate Telecommunications Services Western Digital Corporation The opinions expressed here are mine, not Western Digital's.