Re: State of NFSv4 VolatileFilehandles

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On Aug 2, 2011, at 7:58 AM, Venkateswararao Jujjuri wrote:

> We at IBM receiving multiple customer requests for supporting NFSv4 server migration.
> I have referred to Trond and Chuck's presentations at 2011 Connectathon and there appears to be
> sizable work remaining. I am not sure if there is any progress made since those talks.
> 
> I would like to open up a discussion thread on the mailing list to understand the latest status.
> Also would like to get the input on the Volatile Filehandles (VFH). I searched the mailing list, and could not
> find any recent discussion on this.
> 
> Some discussion points:
> - What are the pieces left to attain full client/server support for seamless server migration?

The client migration implementation is code complete and in test now.  This includes both minor version 0 and 1.  We don't have any mv1 servers to test with at this time, so that support is provisional.  I hope to have patches ready for the 3.2 merge window, but you can see what I've got now on git.linux-nfs.org.

A problem is that there are corner cases in the v4.0 migration specification that are still unresolved.  We are working with the NFSv4 WG to get these addressed.  But I expect some minor changes even after the patches are merged upstream.

We don't have firm plans for a server migration implementation on Linux at this time, but Bruce can maybe say more about that.

> - Any discussion/sugestions on the way to implement VFH?  As described in RFC 3530 sections 4.2.3 and 4.2.4?

I think we are avoiding volatile file handles as long as possible.  We don't have plans to implement them at the moment.

> - Are there any community efforts going / about to start in this area? so that we can partner and get
>  things done instead of duplicating the work.
> 
> Thanks a lot for your help
> JV

-- 
Chuck Lever
chuck[dot]lever[at]oracle[dot]com




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