HP StorageWorks EVA Cluster Extension Software Administrator Guide (T3667-96045, April 2010)

See the HP StorageWorks Continuous Access EVA Implementation Guide for more information.
Rolling disaster protection and snapshots/snapclones
To implement rolling disaster protection, you can create Business Copy EVA disk pairs for DR groups
locally. The Business Copy EVA snapshots or snapclones must not be presented to the local cluster
node because MSCS uses the disk's signature to identify a cluster disk, and the cluster software cannot
differentiate between the original disk and the clone if both are presented to the same server.
HP Storage Management Initiative Specification
To control Continuous Access EVA-mirrored vdisks from a server, EVA Cluster Extension uses the HP
SMI-S interface. The HP SMI-S client implemented in the EVA Cluster Extension cluster integration, or
in the CLI, communicates with the HP SMI-S server running on the Command View EVA management
server.
NOTE:
In this context, the term management server refers to the server running HP Command View EVA. The
management server could be a general-purpose server, dedicated management server, ProLiant
Storage Server, or SMA.
Consider the following about the HP SMI-S server:
• The HP SMI-S server implements the programmatic interface and functionality of the Command
View EVA and Continuous Access EVA user interfaces.
• HP SMI-S uses the CIM and WBEM specifications to define common models for storage hardware
and storage functions.
• For EVA Cluster Extension, an HP SMI-S server is required to control Continuous Access EVA op-
erations and to gather storage system status information. The HP SMI-S server names are stored
as objects, and an encrypted configuration file stores access information for each application
service. In addition, you can configure several management servers to provide additional redund-
ancy, so that EVA Cluster Extension will switch to the next available management server when a
management server becomes unavailable.
• The HP SMI-S software must be installed on each management server and should be running at
all times to provide failover capability.
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