A: The use of the locking mechanisms in NAS requires a degree of cooperation by the software application that uses it. If the software doesn't explicitly state that it works with NFS or Common Internet File Systems (CIFS) locking semantics, it may not operate as advertised and you'll run into some interesting - and very frustrating - anomalies when you have shared access to data. An e-mail client is a prime candidate for these types...
Q: Which non-EMC NAS devices provide a gateway to connect to an EMC Symmetrix SAN?
While not a NAS head or gateway, Veritas' ServPoint for NAS supports Symmetrix as a storage system attached to a Sun server. Many other NAS gateways could use Symmetrix, but they aren't qualified with it, meaning that it hasn't been tested and isn't supported.
Randy Kerns, Evaluator Group Inc.