HP P4000 9.0 HP StorageWorks P4000 SAN Solution User Guide - Page 180
Prerequisite, Storage systems and cluster capacity, Example, Adding storage to a cluster
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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 "Guide for volumes" on page 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
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