Dell PowerVault NX1950 - Manual (Page 49)

Upgrading your SAN and Network
49
Upgrading your SAN and Network
A properly configured cluster does not have shared hardware components.
This enables you to recover from the failure of almost any component in your
cluster configuration. However, you may encounter a situation where you
have to upgrade some component of your cluster like a cluster node, a
component in a node, or a segment of a network.
Upgrading Components in Your Cluster
When you upgrade a component in your Dell™ PowerVault™ NX1950 cluster
node:
1 Use the Cluster Administrator to determine if the node has control of the
cluster resources. If the node has control of the cluster resources, use the
Cluster Administrator to fail over the resources to another node.
2 After you have moved the resources from the node, pause the node. At this
point, you can safely perform work on that node.
Use this same process if you are performing maintenance on a network
switch, because a switch failure is equivalent to a link failure.
You may also be required to update the firmware on the Dell|Equallogic PS
Series storage arrays in the group. When updating firmware on an array, you
must restart the array. This causes a service interruption for any application
using the volumes stored on the array, because the volumes is unavailable for
the time that it takes the array to restart. For detailed information about
updating PS Series, see the PS Series firmware Release Notes.
Book.book Page 49 Monday, February 4, 2008 1:26 PM