🚀 go-pugleaf

"Bill Meredith" <wmeredit@idirect.com> wrote in message
news:S8I97.41850$uH4.2282703@news20.bellglobal.com...
> EMC has a product called Celerra Highroad (part of our NAS offering) that
> does what you're looking for. The Celerra is attached to the Symmetrix
disk
> array, and fields file requests made via standard NFS (or CIFS) protocol.
> The data is returned to the NFS client (in your case, the Sun servers)
> accross the SAN.

Is that really how it works?  My impression had been that the Celerra server
made the location of the desired data available to the client, and that the
client then requested it directly (rather than using a three-corneded
sequence and device-level third-party transfers as you describe).  I'd also
suspected that where byte-range locking activity was not present the client
cached this location information (with appropriate recall provisions should
it change) such that it did not need to contact the Celerra server on every
data access.

I realize that this requires extensions to the NFS and CIFS protocols used
by the client, but it's not obvious how one could return information via the
SAN (rather than the request LAN) without such changes anyway.  One of the
documents on the Web site you refer to at least seems to suggest that things
work as I described them above.  Hope you can provide more details if these
impressions are incorrect.

- bill