[pnfs] MDS exporting pNFS and non-pNFS file systems

[Dean Hildebrand]

William A. (Andy) Adamson wrote:
> the getattr fs_layout_type is not supported on non-pnfs file systems.
I guess that would be a "does not support pNFS" indication.
Dean
>
> -->Andy
>
> On 2/5/08, *Muntz, Daniel* <Dan.Muntz at netapp.com 
> <mailto:Dan.Muntz at netapp.com>> wrote:
>
>     What are people doing to support exporting pNFS and non-pNFS file
>     systems from an MDS?  The information from EXCHANGE_ID is not
>     per-file-system, so can't be used to determine if a particular file
>     system is pNFS-enabled.  Based on talking with Ricardo and Mike,
>     we were
>     thinking perhaps GETATTR could be used.  E.g., GETATTR could return a
>     layout type of 0 for entities that do not support pNFS.
>
>     Perhaps the IBMers have some thoughts on this.  If you had a server
>     exporting 2 GPFS file systems, and you wanted to export one with pNFS
>     and one without, how would you want to handle this in the
>     protocol?  For
>     that matter, how would you want to handle it from a UI
>     perspective?  For
>     GPFS, an /etc/exports flag might make sense.  This wouldn't really
>     work
>     well for spNFS though.  For GPFS I assume you could switch back and
>     forth between exporting with/without pNFS.  For spNFS, you're
>     committed
>     to exporting with pNFS (exporting without pNFS would result in
>     access to
>     the files on the MDS).
>
>       -Dan
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