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- Newsgroups: comp.protocols.nfs
- Path: sparky!uunet!decwrl!pa.dec.com!decuac!hussar.dco.dec.com!mjr
- From: mjr@hussar.dco.dec.com (Marcus J. Ranum)
- Subject: Re: NFS corruption discovery
- Message-ID: <1992Aug20.042224.11176@decuac.dec.com>
- Sender: news@decuac.dec.com (USENET News System)
- Nntp-Posting-Host: hussar.dco.dec.com
- Organization: Digital Equipment Corporation, Washington ULTRIX Resource Center
- References: <1992Aug19.225010.18306@den.mmc.com>
- Date: Thu, 20 Aug 1992 04:22:24 GMT
- Lines: 21
-
- >I've also looked at lan traffic and I've discovered the UDP checksum is off
- >for NFS packets. Unfortunately the net isn't reliable enough [...]
-
- Some vendors sell operating systems that have UDP checksumming
- turned off, so they can benchmark a little bit faster. Others sell
- versions of NFS that do asynchronous writes. Some of them will tell
- you of the risks, and others won't.
- "The network is the computer" - I.e.: you better trust the
- network 'cuz your operating system for damn sure isn't looking out
- for you!
- I believe that never versions of some of these vendor's
- UNIX have UDP checksumming turned on by default. It's about time,
- but I'll be kind of disappointed, since it's always nice in a
- competitive situation to be able to copy and sum files over a
- noisy network, or to do a mess of writes and then power their
- server down, and let their sales reps explain to the customer
- what happened to their benchmark data... :)
- Digital's ULTRIX runs with UDP checksumming on *ALWAYS*
- and with synchronous NFS *always*.
-
- mjr.
-