Cluster Management Overview - HP StorageWorks SR2122 User Manual

Cluster Management Overview

You can configure storage routers in a cluster to allow the storage routers to back
each other up in case of failure.
Note:
routing.
A storage router cluster consists of two SR2122-2 storage routers connected as
follows:
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In a cluster, storage routers continually exchange HA information to propagate
configuration data to each other and to detect failures in the cluster. The storage
routers exchange HA information through two separate networks: one connected
to the management interface of each storage router and the other connected to the
HA interface of each storage router. To make sure that HA information is
exchanged reliably between storage routers, the storage routers balance the
transmission of HA information between the management and the HA interfaces.
A storage router cluster supports up to 12 active instances of SCSI routing. At any
given time, an instance of SCSI routing can run on only one storage router in a
cluster. The instance continues running on the storage router where it was started
until one of the following actions occurs:
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■
See
about configuring a high availability cluster.
IP Storage Router SR2122-2 User Guide
A storage router can participate in a cluster only if it is deployed for SCSI
Connected to the same hosts
Connected to the same storage systems
Connected to each other through their management and high availability (HA)
interfaces
The instance is explicitly stopped or failed over to the other storage router in
the cluster.
The instance automatically fails over to another storage router because an
interface is unavailable or another software or hardware problem occurs.
Chapter 11, "Configuring a High Availability Cluster"
Software Overview
for more information
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