Server and Cluster Administration Guide for Hitachi NAS Platform

Part Number

Clustering provides the following functionality:

  • Hosting of multiple EVSs on each node in a cluster. Cluster nodes can simultaneously host multiple EVSs, allowing all servers to be active at the same time, each providing file services to clients.
  • Redundant monitoring and transparent failover of EVS hosts. The cluster monitors the health of each server through redundant channels. Should one server fail, the EVSs hosted by that node are migrated to another cluster node, which takes over the failed node's functions transparently to network clients, so no loss of service results from a single node failure. After the failed node is restored and is ready for normal operation, previously hosted EVSs can be migrated back.
    Note: During the time a node is off line, and during the restoration of the failed node, the cluster may operate with reduced performance.
  • Redundant availability of configuration settings for all nodes. The cluster provides a cluster-wide replicated registry, containing configuration information for all nodes in the cluster.

The following sections discuss options for configuring server nodes as clusters to expand their functionality.