Geographically Dispersed Clusters; Hp Storage Works Nas Software Updates; Cluster Groups And Resources, Including File Shares - HP StorageWorks 4000s - NAS Administration Manual

Cluster Administration

Geographically Dispersed Clusters

Cluster nodes can be geographically dispersed to provide an additional layer of fault tolerance.
Geographically dispersed clusters are also referred to as stretched clusters.
The following rules must be followed with geographically dispersed clusters:

HP Storage Works NAS Software Updates

After cluster installation has been completed, run the cluster update tool located in the Cluster
Install Guide in the WebUI. The Cluster Installation Guide is located under the Cluster tab.
This must be done after the cluster installation is complete. It is necessary to run this tool on
all cluster nodes.
Figure 120: Cluster update tool
This completes the initial cluster installation.

Cluster Groups and Resources, including File Shares

Management tasks for a cluster include creating and managing cluster resources and cluster
groups. The Cluster Administrator tool provides complete online help for all cluster
administration activities. Cluster resources are created and then assigned to logical,
organizational groups. Ownership of these groups should be assigned in a balanced
arrangement between the server nodes, distributing the processing load between the two
nodes.
Cluster resources include administrative types of resources as well as file shares. The
following paragraphs include overview and planning issues for cluster groups, cluster
resources, and clustered file shares.
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A VLAN connection with latency of 500 milliseconds or less ensures that cluster
consistency can be maintained. If the VLAN latency is over 500 milliseconds, the cluster
consistency cannot be easily maintained.
All nodes must be on the same subnet.
NAS 4000s and 9000s Administration Guide