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Date:      Tue, 1 Jul 1997 09:28:10 -0700 (MST)
From:      Terry Lambert <terry@lambert.org>
To:        tom@sdf.com (Tom Samplonius)
Cc:        terry@lambert.org, chuckr@glue.umd.edu, lmcsato@lmc.ericsson.se, freebsd-hackers@FreeBSD.ORG
Subject:   Re: NFS V3 is it stable?
Message-ID:  <199707011628.JAA18500@phaeton.artisoft.com>
In-Reply-To: <Pine.BSF.3.95q.970630194523.16592A-100000@misery.sdf.com> from "Tom Samplonius" at Jun 30, 97 07:50:58 pm

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> > >   I've had sites report that even going Solaris to Solaris using the
> > > Solaris propietary lockd stuff, they still can get trashed mailboxes.
> > > Locking of any kind over NFS just isn't reliable.
> > 
> > This is only true if your NFS violates the NFS write guarantees,
> > which SVR4 and Solaris do, by default.  Turn off write gathering
> > and write caching (the "adb" commands are listed in the Network
> > Administration Manual) and the problem will go away.
> 
>   So you make a trade reliable locking for performance?  I'd take
> performance any day, and just forget about exporting mailboxes.

No, you make a trade: reliable data commits for any software which
requires them (CVS, databases, etc.) for "performance".

Note the quotation marks: I can make any software run as fast as
you want me to make it run, so long as it doesn't have to work.

> > Netscape is a known rogue client.  Among other things, it does not
> > cache the correct seperator character on a per "#xxx" namespace
> > escape.  So if you were reading news in "#news" (seperator "."),
> > and went to create a new mail folder, it wouldn't use "/" as the
> > component seperator when communicating the new forlder path to the
> > server.
> 
>   Works with the Cyrus server, which is all I care about.
> I don't think the imap spec hides enougth server implementation details,
> which makes clients overly complex.

Well, the Cyrus server doesn't handle namespaces other than the
mailbox namespace, so it's not an issue.

IMAP4 *does* hide a number of things from the client, like the
requirement that the client implement MIME, or that the client
implement a ".newsrc" for article "seen/not seen" marking in
the #news namespace, etc..

The most annoying thing is the parenthetical presentation of headers
in the "FETCH" command.

Mostly, I'd say it hides different things than previous specifiactions.


					Terry Lambert
					terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.



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