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A project employs two DELL 2950 servers to provide the Microsoft cluster service (MSCS) for Exchange mail service, and the previous cluster service employs a storage device from the vendor H and uses iSCSI links for communication. The previous storage device mapped three LUNs to the cluster, with capacity of 500 MB, 500 MB and 1.4 TB respectively.
After stopping services, both the previous storage device and the S5300 are mapped to the VIS, and the data migration is completed by using the previous storage device as the data source to create a mirror volume. After completing the migration, the VIS is then powered off. The cluster is installed with the UltraPath and connects to the S5300 using the multipath networking. When one of the ASs of the cluster is started, the OS of the AS recognizes two LUNs with each capacity of 500 MB, but fails to recognize the file system of the LUN whose capacity is 1.4 TB.
A cluster is a collection of computers that are running the same software and are interconnected to present as a virtual host to provide service for clients and applications. All the computers in the cluster are physically interconnected through cables and are virtually interconnected through a cluster software, which enables fault tolerance and load balancing that cannot be implemented by a single computer.