Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uwm.edu!archimedes.math.uwm.edu!jgreco From: jgreco@archimedes.math.uwm.edu (Joe Greco) Newsgroups: comp.sys.ibm.pc.rt Subject: Re: RS/6000 and RT workstation 6152 - NFS, anyone? Message-ID: <7101@uwm.edu> Date: 19 Oct 90 21:28:03 GMT References: <6936@uwm.edu> <772@troi.dbaccess.com> Sender: news@uwm.edu Organization: University of Wisconsin, Milwaukee - Department of Mathematics Lines: 36 In comp.sys.ibm.pc.rt article <772@troi.dbaccess.com>, peter@dbaccess.com (Peter A. Castro) wrote: :in article <6936@uwm.edu>, jgreco@archimedes.math.uwm.edu (Joe Greco) says: :+ I'm exporting /u and /usr on the 6000. The user directories are in /u. :+ That's where I've got my temporary directory, too. I can successfully :+ mount /u on the 6152's and read to my heart's content (at least so far), but :+ if I try any major writes, I get locked in a NFS disk write on the 6152 (ps :+ shows 'waiting for device I/O') and eventually I'll get "NFS server thales :+ not responding... still trying" .... : Not really. There could be another problem which should have been in your : 6000 documentation concerning networking with the RS/6000 and a PC/RT. This : concerns the size of an Ethernet packet. On the RTs this size is about 1518 : bytes in length (inetlen). On the RS/6000 the length of a packet is 1500. : This can lead to problems that I'm sure you can imagine on your own. Look : in the file /etc/net on your RTs, and you'll see a stanze like the following: Hey, all right! Except I'm running AOS, not AIX (I assume this is an AIX-fix). However, you did hit the nail on the head - I set the read and write sizzes in /etc/fstab to be 1024 or 1280 or some nice even number like that. Suddenly things work (albeit somewhat more slowly) with the RS/6000. I had experimented with raising the sizes and hadn't lowered them sufficiently to discover this. I'm using 4096 for inter-RT NFS (not sure if this is even valid, but it does seem a bit faster than 2048). ... Joe ------------------------------------------------------------------------------- Joe Greco - University of Wisconsin, Milwaukee - Department of Mathematics jgreco@archimedes.math.uwm.edu USnail: Joe Greco Voice: 414/321-6184 9905 W. Montana Ave. Data: 414/321-9287 (Happy Hacker's BBS) West Allis, WI 53227-3329 ICBM: 43 05 20 N 87 53 10 W #include Disclaimer: I don't speak for the Math Department, the University, or myself.