Prerequisite; Adding Storage To A Cluster; Removing A Storage System From A Cluster - HP StorageWorks P4000 User Manual

Prerequisite

Add the storage system to the management group that contains the existing cluster.
Storage systems and cluster capacity
Be certain that the capacity of the storage system you add to the cluster matches, or is close to, the
capacity of those already in the cluster. All storage systems in a cluster operate at a capacity equal
to that of the smallest-capacity storage system. If you add a storage system with a smaller capacity,
the capacity of the entire cluster will be reduced.
While you can mix storage systems with different RAID levels in a cluster, note that the capacity
limitation applies to the available capacity as determined by RAID, not the raw disk capacity.
Example
If you have three storage systems, two of which have a capacity of 1 TB, and one of which has a
capacity of 2 TB, all three storage systems operate at the 1 TB capacity.

Adding storage to a cluster

1. Select the cluster in the navigation window.
2. Click Cluster Tasks, and select Edit Cluster.
If there are no storage systems in the management group available to add to the cluster, the Add
Systems button will be greyed out.
3. Click Add Systems.
4. Select one or more storage systems from the list.
5. Click OK.
6. Click OK again in the Edit Clusters window.
A confirmation message opens, describing the restripe that happens when a storage system is
added to a cluster.
7. Click OK to finish adding the storage system to the cluster.

Removing a storage system from a cluster

You can remove a storage system from a cluster only if the cluster contains sufficient storage systems
to maintain the existing volumes and their data protection level. See
206 for details about editing volumes.
1. In the Edit Cluster window, select a storage system from the list.
2. Click Remove Systems.
In the navigation window, that storage system moves out of the cluster, but remains in the
management group.
3. Click OK when you are finished.
180 Working with clusters
"Guide for volumes" on page