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From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.protocols.nfs
Subject: Re: NFS client has out-of-date files
Message-ID: <2536@auspex.auspex.com>
Date: 7 Oct 89 19:04:51 GMT
References: <17787@bellcore.bellcore.com> <1967@convex.UUCP> <1989Oct6.203732.12847@acd4.UUCP> <125974@sun.Eng.Sun.COM>
Reply-To: guy@auspex.auspex.com (Guy Harris)
Distribution: na
Organization: Auspex Systems, Santa Clara
Lines: 24


 >In the NFSSRC 4.0 reference port
 >
 >               acregmin=n    Hold cached attributes for at  least
 >                             n seconds after file modification.
 >               acregmax=n    Hold cached attributes for  no  more
 >                             than  n seconds after file modifica-
 >                             tion.

...

You forgot to mention that those are per-mount options from "/etc/fstab"
in SunOS 4.x and NFSSRC4.0, as opposed to per-system options to tweak
by patching kernel variables.

 >In an internal version of NFS, there is also an option to turn off caching
 >on a mount point.

If you're referring to "noac", it's in SunOS 4.0.3, and even documented
in MOUNT(8):

               noac          Suppress attribute caching.

Some code for it is in NFSSRC4.0 as well.