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Date:      Thu, 2 Aug 2007 10:18:24 -0400 (EDT)
From:      Rick Macklem <rmacklem@uoguelph.ca>
To:        Patrick Tracanelli <eksffa@freebsdbrasil.com.br>
Cc:        freebsd-fs@freebsd.org
Subject:   Re: Xsan (Apple) on FreeBSD
Message-ID:  <Pine.GSO.4.63.0708021011570.10381@muncher>
In-Reply-To: <46B1D167.4030206@freebsdbrasil.com.br>
References:  <46B0F505.8090102@freebsdbrasil.com.br> <a969fbd10708011502n5dd8034m7cc0abef3a62c5e6@mail.gmail.com> <46B10798.5050504@freebsdbrasil.com.br> <200708011536.37926.matt@ixsystems.com> <46B12D0C.20808@freebsd.org> <46B1D167.4030206@freebsdbrasil.com.br>

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On Thu, 2 Aug 2007, Patrick Tracanelli wrote:

> BTW, what about NFS4? Is performance improvement a goal, or just 
> security/kerberos/auth stuff? I have been running NFS4 with gssd, which shall 
> decrease performance. Ill do some benching without gssd comparing to NFS3.
>
There is a feature (Delegations) in NFSv4 that I think will help a lot
w.r.t. performance (it essentially gives a client exclusive rights to a
file). However, to the best of my knowledge, none of the extant clients
are using it effectively. (Solaris10 shipped with minimal delegation
support.)

I am just testing Delegation stuff, so I should know soon how much it
helps performance. But a production quality implementation of NFSv4
with delegations (client side) isn't out there at this point, from
what I know.

rick




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