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Re: [nfsv4] New version of sparse draft (draft-hildebrand-nfsv4-read-sparse-01.txt)

Thomas Haynes <thomas@netapp.com> Thu, 30 September 2010 16:43 UTC

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From: Thomas Haynes <thomas@netapp.com>
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Subject: Re: [nfsv4] New version of sparse draft (draft-hildebrand-nfsv4-read-sparse-01.txt)
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On Sep 30, 2010, at 11:06 AM, Matt W. Benjamin wrote:

> Hi,
> 
> """
> In addition, when a data server is returning a
>   READ4reshole structure, it should still contain the offset and length
>   of the next allocated block in the file, even if that block is not
>   located on that particular data server.
> """
> 
> I had the impression that there could be valid pnfs implementations for which this might be an onerous requirement.  Is that not the case?
> 
> Matt


On the server or client side?

On the server side, it might have to contact the MDS to get the information
or the MDS might have already informed the DS about the holes in the
file. Yes, very implementation dependent.

On the client side, converting an offset to a DS via the layout should
be very straight forward.



> 
> ----- "Dean Hildebrand" <seattleplus@gmail.com> wrote:
> 
>> Hello,
>> 
>> I uploaded a new version of our internet draft "Simple and Efficient
>> Read Support for Sparse Files".
>> 
> 
> -- 
> 
> Matt Benjamin
> 
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