Re: Minutes from Santa Fe DFS-WG meeting
"Drew D. Perkins" <ddp@interstream.com> Thu, 05 December 1991 16:19 UTC
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From: "Drew D. Perkins" <ddp@interstream.com>
To: dfs-wg@citi.umich.edu, honey@citi.umich.edu
Cc: mdavies@NRI.Reston.VA.US
Date: Thu, 05 Dec 1991 11:02:17 -0500
Subject: Re: Minutes from Santa Fe DFS-WG meeting
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From: Peter Honeyman <honey@citi.umich.edu> Date: Thu, 5 Dec 91 00:06:06 EST Subject: Minutes from Santa Fe DFS-WG meeting NFS/TCP is commercially available, and is under development by many vendors. Connection maintenance is not entirely a solved problem. Four vendors demonstrated NFS over TCP at Interop Fall '91: FTP Software - OS/2 InterCon - Macintosh INTERSTREAM - SunOS TGV - VMS Other vendors with plans in this area include: FTP Software - DOS Sun - Solaris USL - SVR4 I gave a talk on NFS over TCP at the Sun ONC/NFS conference '91. I can make copies of slides available if anyone is interested. Topics included solutions to connection maintenance as well as benefits of NFS/TCP vs. NFS/UDP, performance, etc.. Sun/RPC over TCP has problems with accurate RTT because the network latency is smeared by the upper-layer (i.e., NFS) service times. (See "Transport Issues in the Network File System" by Bill Nowicki, Computer Communication Review 19(2), pp. 16-20 (April, 1989) for related work.) I assume you meant Sun/RPC over UDP, not TCP. Specifically, using UDP causes the RTT to include disk queueing factors. You are really measuring the RTT to the disk, NOT the RTT of the network. Tests so far indicate a very significant (order of magnitude) reduction in retransmissions using our NFS/TCP vs. NFS/UDP. Drew Perkins INTERSTREAM, Inc. email: ddp@interstream.com 1501 Reedsdale St. voice: (412) 323-8000 Pittsburgh, PA 15233-2329 fax: (412) 323-1930
- Minutes from Santa Fe DFS-WG meeting Peter Honeyman
- Re: Minutes from Santa Fe DFS-WG meeting Drew D. Perkins
- Re: Minutes from Santa Fe DFS-WG meeting Peter Honeyman
- Re: Minutes from Santa Fe DFS-WG meeting Ralph E. Droms
- Re: Minutes from Santa Fe DFS-WG meeting stev knowles
- Re: Minutes from Santa Fe DFS-WG meeting Peter Honeyman