Re: [PATCH 0/4] nfs41: allow layoutget at pnfs_do_multiple_writes

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On Tue, 2011-11-29 at 14:40 -0800, Boaz Harrosh wrote: 
> On 11/29/2011 01:57 PM, Trond Myklebust wrote:
> >> Also Files when they will support segments and servers that request segments,
> >> like the CEPH server, will very much enjoy the above, .i.e: Tell me the amount
> >> you know you want to write.
> > 
> > Why would we want to add segment support to the pNFS files client???
> > Segments are a nuisance that multiply the amount of unnecessary chitchat
> > between the client and the MDS without providing any tangible
> > benefits...
> > 
> 
> Your kidding right?
> 
> One: it is mandated by the Standard, This is not an option. So a perfectly
>      Standard complaint server is not Supported by Linux because we don't see
>      the point.

Bollocks.. Nothing is "mandated by the Standard". If the server doesn't
give us a full layout, then we fall back to write through MDS. Why dick
around with crap that SLOWS YOU DOWN.

> Two: There are already file-layout servers out there (multiple) which are
>      waiting for the Linux files-layout segment support, because the underline
>      FS requires Segments and now they do not work with the Linux client. These
>      are CEPH and GPFS and more.

Then they will have a _long_ wait....

Trond

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@xxxxxxxxxx
www.netapp.com

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