Powering Up The Cluster; Shadow Copies In A Clustered Environment - HP ProLiant 300 Series Administration Manual

CAUTION:
The cluster nodes should never be powered on when the storage subsystem is not available.

Powering up the cluster

The power up process for the storage server cluster is more complex than it is for a single node because
extra care must be taken with the storage subsystem.
The sequence of the power up steps is critical. Improper power up procedures can cause corruption
and loss of data.
CAUTION:
Do not power up the cluster nodes without first powering up the storage subsystem, and verifying it
is operating normally.
Nodes should be powered up separately allowing one node to form the cluster prior to powering up the
additional node(s). To power up the cluster nodes:
1. After the storage subsystem is confirmed to be operating normally, power up a single node. Wait for
the node to come completely up before powering up the subsequent node.
If more than one node is powered up at the same time, the first node that completes the sequence
gains ownership of the cluster quorum and controls the cluster database. Designate a particular node
as the usual cluster quorum owner by always powering up that node first and letting it completely
restart before powering up additional cluster node(s).
2. Power up the additional cluster node(s). Each node should be allowed to start fully, prior to starting
a subsequent node.
As each node starts, the monitor displays the logon dialog. Background processes start the cluster
service and form the cluster.

Shadow copies in a clustered environment

The creation and management of clustered Shadow Copy resources in a cluster should be performed
using the WebUI by clicking the Disk tab, and then clicking Shadow Copy or from the file system by
right-clicking the volume, and then clicking Shadow Copy.
Assuming the underlying disk is part of a cluster, both methods will generate a cluster resource on the
cluster that is viewable from Cluster Administrator and the Cluster Resource tab of the WebUI. While
the ability to create the Shadow Copy Resource is available in the Cluster Administrator Management
Tool, this operation is not supported by Microsoft. The resource may be taken offline/online and
managed with the group via all means available.
As recommended in the Shadow Copy chapter, the location of the cache file is recommended on a
separate disk from the original data. In this case, a physical disk resource for the cache file disk should
be created in the same cluster group as the intended Shadow Copy resource and the volume for which
snapshots will be enabled. The resource should be created prior to the establishment of Shadow Copies.
The Shadow Copy resource should be dependent on both the original physical disk resource and the
physical disk resource that contains the cache file. The update of the Shadow Copy schedule may be
done via the Cluster Administrator tool, the WebUI, or the file system.
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Cluster Administration