management jurisdictions. A virtual X-blade provides a logically partitioned
file server. If your users manage their own file server, they can retain their
"perceived" management by using a virtual X-blade; however, you can still
consolidate their storage along with other users under one NSX blade
server.
EMC's NAS products run the DART operating environment, which provides
high-end capabilities such as sophisticated file replication and mirroring,
and automatic volume management that allows administrators to increase
file-system space without client intervention. EMC NAS gateways support
only EMC back-end storage.
Windows Storage Server (WSS) gateways: Many NAS storage
companies, from Dell Inc. to Xiotech Corp., offer NAS gateway products
based on WSS software. Most WSS products are configured as gateways,
and all provide similar base functionality. Windows client support is very
tight to allow for easier deployment. Using CIFS or NFS and Windows
Distributed File System (DFS), WSS provides a clustered file system that's
accessible across all active nodes. You can configure from two to eight
nodes for high availability and performance scalability. WSS configures
nodes as active for servicing data or as passive for cluster failover.
Hewlett-Packard's (HP) ProLiant Storage Server NAS gateway is based on
WSS and attaches to HP and third-party SAN storage. SAN storage
capabilities such as replication and mirroring can be accessed directly. For
HP EVA storage, replication can be invoked from the NAS graphical
management interface directly. Other third-party SAN storage replication
requires other third-party software.
NetApp's V-Series NAS gateway: Formerly called gFiler (GF980 and
GF960), NetApp renamed the product line the V-Series and recently
introduced its V3050 and V3020 products. These products provide a one-
or two-box (for high availability) gateway that attaches to SAN storage from
Hitachi Data Systems Inc., HP, IBM Corp. and Sun Microsystems Inc. V-
Series products provide a maximum of 96TB of NAS space. A V-Series
cluster can be configured in active/active mode sharing data service to
back-end storage and can also be configured for automated failover.
NetApp's Ontap 7G operating system supports all enterprise-class
capabilities. With Ontap 7G's "flex volumes," an administrator can
oversubscribe file space because file-system space can grow or shrink
without user intervention. For physical consolidation, NetApp provides up
to 32 "virtual filers" configurable as management points to isolate one
department's data services from another's.
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