3.7.0 HP StorageWorks HP Scalable NAS File Serving Software administration guide - HP Scalable NAS 3.7 for Linux (AG513-96002, October 2009)

Export records and groups
The PSFS filesystems to be exported are described in export records, which are similar
to the entries in an /etc/exports file. They specify the directory to be made
available for mounting by NFS clients, the clients that can mount the directory, and
the permissions on the directory.
When you configure an Export Group, you will need to create an export record for
each filesystem or directory to be exported. You can create the records either
manually, or by importing an existing /etc/exports file. You will also need to
select one or more Virtual NFS Services to host the Export Group.
Virtual NFS Services
Each Export Group may be associated with one or more Virtual NFS Services. A
Virtual NFS Service provides an IP address that NFS clients can use to access the
PSFS filesystems exported by the associated primary server; in effect, it “virtualizes”
the IP address associated with the NFS Service. NFS clients access the filesystems
through the Virtual NFS Service; they do not need to know which physical node is
providing the service. Clients can access any of the filesystems specified in the Export
Group by using the DNS name or IP address of the Virtual NFS Service.
When you create a Virtual NFS Service, you will need to assign it to a primary node
and one or more backup nodes. A Virtual NFS Service can be associated with only
one Export Group. However, you can assign the same Export Group to multiple
Virtual NFS Services.
One or many Export Groups?
In the typical configuration, a single Export Group associated with multiple Virtual
NFS Services is recommended.
High availability and failover support
FS Option provides high availability for the exported PSFS filesystems. To ensure that
the filesystems are always available, FS Option provides a global NFS monitor for
the system as well as a high-availability monitor for each Export Group. The global
NFS monitor periodically checks the NFS service and the FS Option processes on
each node. On each server configured for the Export Group, the Export Group
monitor periodically checks the exported filesystems to determine if they are mounted.
Configure FS Option for Linux164