[pnfs] Linux pNFS road map

[Marc Eshel]

I know that this what the protocol requires but why would you choose to do 
i/o through the MDS when the performance is guarantied to be worst, even 
for small files. I think that to make this really usable it will take much 
more work and I believe that trying to extend GFS2 to support pNFS is much 
better route to take. We can talk about it some more in tomorrow's status 
meeting.
Marc.

pnfs-bounces at linux-nfs.org wrote on 12/12/2007 11:54:13 AM:

> marc,
> 
> the client may elect to send I/O requests to the MDS for reasons other 
> than failure, e.g., small requests.
> 
>    peter
> 
> On Dec 12, 2007, at 10:35 AM, Marc Eshel wrote:
> 
> > pnfs-bounces at linux-nfs.org wrote on 12/11/2007 11:23:39 PM:
> >
> >> It does not use a cluster FS.
> >>
> >> The file system on the MDS and the DSs can be any physical fs.  E.g.,
> >> for our testing we've been using either ext2 or ext3 (or mixed) on 
> >> the
> >> MDS and DSs.  It does not currently perform i/o through the MDS, 
> >> though
> >> it would probably work to do as Bruce suggested and have the MDS 
> >> act as
> >> a client of itself.
> >
> > I am not sure what that means. For the MDS to do i/o it needs to
> > communicate with the corresponding DS for that i/o and if the client
> > failed in doing the i/o through the DS I don't see that the MDS will a
> > better chance.
> > Marc.
> 
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