HP StorageWorks X3000 Network Storage Systems - Manual (Page 105)

Restarting one cluster node
CAUTION:
Restarting a cluster node should be done only after confirming that the other node(s) in the cluster
are functioning normally. Adequate warning should be given to users connected to resources of the
node being restarted. Attached connections can be viewed through Server Manager on the storage
system Desktop using Terminal Services. From Server Manager, select
File Sharing > Shared Folders > Sessions.
The physical process of restarting one of the nodes of a cluster is the same as restarting a storage
system in single node environment. However, additional caution is needed.
Restarting a cluster node causes all cluster resources served by that node to fail over to the other nodes
in the cluster based on the failover policy in place. Until the failover process completes, any currently
executing read and write operations will fail. Other node(s) in the cluster will be placed under a
heavier load by the extra work until the restarted node comes up and the resources are moved back.
Shutting down one cluster node
CAUTION:
Shutting down a cluster node must be done only after confirming that the other node(s) in the cluster
are functioning normally. Adequate warning should be given to users connected to resources of the
node being shutdown.
Shutting down a cluster node causes all cluster resources served by that node to fail over to the other
node(s). This causes any currently executing client read and write operations to fail until the cluster
failover process completes. The other node(s) are placed under a heavier load by the extra work until
the second node is powered up and rejoins the cluster.
Powering down the cluster
The power down process for the storage system cluster is similar to the process for a single node, but
with the cluster, extra care must be taken with the storage subsystem and the sequence of the shutdown.
The power down process is divided into two main steps:
1. Shutting down the cluster nodes
2. Removing power from the cluster nodes
The sequence of these steps is critical. The devices must be shut down before the storage subsystem.
Improperly shutting down the nodes and the storage subsystem causes corruption and loss of data.
CAUTION:
Before powering down the cluster nodes, follow the proper shutdown procedure as previously illustrated.
See “
Shutting down one cluster node .” Only one cluster node should be shut down at a time.
X1000 and X3000 Network Storage System 105