Subject: RE: Clustered XFS?
From: Russell Cattelan <cattelan@thebarn.com>
To: "N. Richard Solis" <nrsolis@aol.net>
Cc: Craig Tierney <ctierney@hpti.com>, linux-xfs@oss.sgi.com
In-Reply-To: <LIEIJNKJONCCDDOFLHNBOEKNCFAA.nrsolis@aol.net>
References: <LIEIJNKJONCCDDOFLHNBOEKNCFAA.nrsolis@aol.net>
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Date: 06 Dec 2002 11:35:51 -0600
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On Thu, 2002-12-05 at 12:49, N. Richard Solis wrote:
> So it's more like DAFS then?
No.
DAFS is somewhat misnamed 
actually there are multiple aspect called
DDAFS Device (Direct Access FileSystem)
UDAFS User 
and
FDAFS File 

I don't know what progress has been made with 
UDAFS or FDAFS but DDAFS is simple a protocol to
map a remote file (server) to a local device (client)
which is really only interesting to things that talk
block; like data bases.

Note main point of DAFS is to implement a zero copy
block transfer mechanism, which isn't to say it
can't be used as part of a shared filesystem but
DAFS itself isn't intended to provide any of the 
sharing supported need to do a share file system.

> 
> -----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)
> 
> 
>