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

• NFS client lock re-acquisition on server failover. When a group of NFS clients
fail over to another NFS server, any file or byte-range locks held by those clients
are released and then automatically re-acquired after the clients have successfully
transitioned to another server.
• Group migration of NFS clients. The administrator can gracefully migrate an NFS
service and the associated NFS clients from one server to another for maintenance
or load-balancing purposes, without downtime or failure of any NFS client.
• Cluster-wide consistent user authentication. A user and NFS client may always
be authenticated, by any NFS server in the cluster, as the same user and NFS
client (assuming that an organizational authentication service such as LDAP has
been deployed).
• Cluster-wide, connection-oriented load balancing. Through the use of DNS round-
robin connection load balancing (or any external load balancer), NFS client
connections mounting through a single common IP address (or DNS name) will
be automatically and evenly distributed among the NFS servers in the cluster that
are exporting the same filesystems. The DNS service may also be configured for
high availability on the same file-serving cluster.
The Cluster Volume Manager provides the following features:
• Creation of dynamic volumes. Dynamic volumes can be configured to use either
concatenation or striping. A single PSFS filesystem can be placed on a dynamic
volume.
• Manipulation of dynamic volumes. A dynamic volume, and the filesystem located
on that volume, can be extended to include additional disk partitions. Dynamic
volumes can also be recreated or destroyed.
Overview
The structure of a cluster
A cluster includes the following physical components.
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