HP StorageWorks 4000s NAS 4000s and 9000s Administration Guide - Page 23
NAS Server as a Clustered Pair, Multi Node Support Beyond Two Nodes
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System Overview NAS Server as a Clustered Pair In the clustered configuration, two NAS devices are linked via a private network and have access to shared storage as illustrated in Figure 2. In clustered deployments, it is recommended that each NAS device be attached to the SAN via a pair of fiber channel HBAs. Dual HBAs per NAS device is recommended but not required for cluster deployments, since dual HBAs allow for path failure without causing node failover in the cluster. For the NAS server, cluster setup requires at least three LUNs. One LUN is required for the quorum disk and two LUNs are required for data disks. Individual data disks specific to each node are required for the proper setup of file sharing where both nodes participate in file-sharing activities. Clustered NAS systems have the ability to provide redundant active/active access to file shares on disk. However, as with all Microsoft-based clusters, the unit of ownership among nodes is at the disk level. Therefore, individual fileshares can be accessed by only one node at a time based on which node owns the disk. Cluster Node A Cluster Node B Private Network Node A HBA 1 Node A HBA 2 +++ + +++ + N++o+d+e+B + HBA 2 Node B HBA 1 SAN Switch SAN Switch Cluster Quorum Mirrorset LUN 1 Storage Area Network Data RAID set Node A LUN 2 Data RAID set Node B LUN 3 Figure 2: NAS server as a clustered pair of devices Multi Node Support Beyond Two Nodes The NAS 4000s and 9000s devices may be deployed in multi node clustering beyond two nodes. Refer to the associated Storage Array documentation to determine the number of nodes supported by the array under Windows Storage Server 2003. While the discussion presented in this guide addresses only two nodes, additional nodes may be added into the cluster. Considerations for additional fiber path connections and the private network should be made. In the case of the private network, a hub or switch is required since the cross over cable is no longer applicable. Connecting NAS Servers to the Network The NAS server can be connected to the network as a single device or as a clustered pair. NAS 4000s and 9000s Administration Guide 23