From: "N. Richard Solis" <nrsolis@aol.net>
To: "Craig Tierney" <ctierney@hpti.com>
Cc: <linux-xfs@oss.sgi.com>
Subject: RE: Clustered XFS?
Date: Thu, 5 Dec 2002 13:49:16 -0500
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So it's more like DAFS then?

-----Original Message-----
From: linux-xfs-bounce@oss.sgi.com
[mailto:linux-xfs-bounce@oss.sgi.com]On Behalf Of Craig Tierney
Sent: Thursday, December 05, 2002 1:47 PM
To: N. Richard Solis
Cc: linux-xfs@oss.sgi.com
Subject: Re: Clustered XFS?


I have heard the term clustered NFS but I have never seen an actual
implementation.  In a clustered NFS solution, is every node actually
talking SCSI (Fibre channel usually) to the disk?  That is what CXFS
is doing.  Each node physically hits each disk.  The metadata server
keep track of what everyone is doing and prevents them from stomping on
each other.

Craig


On Thu, Dec 05, 2002 at 12:54:30PM -0500, N. Richard Solis wrote:
> Sounds more like a Clustered NFS solution to me?  Would I be on target
with
> that one?
>
> -----Original Message-----
> From: Craig Tierney [mailto:ctierney@hpti.com]
> Sent: Thursday, December 05, 2002 12:41 PM
> To: N. Richard Solis
> Cc: 'Ray Muno '; 'Steve Lord '; linux-xfs@oss.sgi.com
> Subject: Re: Clustered XFS?
>
>
> The client provides the interface so that when a user does a read
> or write, it translates the commands.  The server takes care of the layout
> and locking (if supported).  Right now you can have a linux box access
> the shared filesystem, but you still need an Irix box to take care of
> the metadata and locking.
>
> I have not worked with CXFS, so I might have exact terminology wrong
> but I think I have the idea right.
>
> Craig
>
> On Thu, Dec 05, 2002 at 12:22:31PM -0500, N. Richard Solis wrote:
> > Client?  Server?  Please correct me if I'm wrong but should there be a
> > distinction?  My understanding of CXFS was that there were enhancements
> made
> > to XFS to cupport concurrent access to a storage pool via a SAN.  To do
> > this, you'd need locking/recovery, and some way to ensure that metadata
> > changes were visible to all the servers that had the same filesystem
> > mounted.  Where does a client fit into all of this?
> >
> >
> > -----Original Message-----
> > From: linux-xfs-bounce@oss.sgi.com
> > [mailto:linux-xfs-bounce@oss.sgi.com]On Behalf Of Tierney, Craig
> > Sent: Thursday, December 05, 2002 11:59 AM
> > To: 'Ray Muno '; 'Steve Lord '
> > Cc: 'N. Richard Solis '; 'linux-xfs@oss.sgi.com '
> > Subject: RE: Clustered XFS?
> >
> >
> >
> > SGI demoed the linux client at SC2002.  The server though is still not
> > ready.  I think the person I talked to said 'in 6 months' but I could
> > be off there.
> >
> > Craig
> > -----Original Message-----
> > From: Ray Muno
> > To: Steve Lord
> > Cc: N. Richard Solis; linux-xfs@oss.sgi.com
> > Sent: 12/5/02 12:13 PM
> > Subject: Re: Clustered XFS?
> >
> > The promise of a Linux client has been out there as long as CXFS has
> > been
> > around as far as I recall.  When is it going to materialize?
> >
> > It has seemed strange to me that SGI can Support Solaris and Windows NT
> > with this environment but Linux support has never been made available.
> >
> >
> > On Thu, Dec 05, 2002 at 10:50:47AM -0600, Steve Lord wrote:
> > > On Thu, 2002-12-05 at 10:43, N. Richard Solis wrote:
> > > > Is anyone working on adding clustering/SAN support to XFS on Linux?
> > > >
> > > > I was looking at the GFS software from Sistina and the OpenGFS
> > project. I'm
> > > > wondering if it's possible to merge the codebases of XFS and OpenGFS
> > to
> > > > provide the clustering functionality on XFS.  Am I crazy?
> > >
> > > Go look for CXFS on SGI's home page. There will be something available
> > > for Linux, but it will not be open source, and what parts of it are
> > > available for hardware other than SGI's is under discussion.
> > >
> > > Steve
> > >
> > > --
> > >
> > > Steve Lord                                      voice: +1-651-683-3511
> > > Principal Engineer, Filesystem Software         email: lord@sgi.com
> > >
> > ========================================================================
> > =====
> >
> >  Ray Muno
> > http://www.aem.umn.edu/people/staff/muno
> >  University of Minnesota                          e-mail:
> > muno@aem.umn.edu
> >  Aerospace Engineering and Mechanics               Phone:     (612)
> > 625-9531
> >  110 Union St. S.E.		                     FAX:     (612)
> > 626-1558
> >  Minneapolis, Mn 55455
> >
> > ========================================================================
> > =====
> >
> >
> >
> >
> >
> >
> > [[HTML alternate version deleted]]
> >
> >
> >
> >
> >
>
> --
> Craig Tierney (ctierney@hpti.com)
>
>
>

--
Craig Tierney (ctierney@hpti.com)