HP Surestore Disk Array FC60 Storage Manager 60-NT Introduction Guide - Page 11
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Managing Storage Arrays Component Description SM60client SM60agent Redundant Dual Active Controller (RDAC) multi-path driver software The SM60client provides the user interface for managing the Storage Arrays. You can install the client software in one of two locations: on a remote management station, or on the host if you want to use it as a management station. See the for details. For more information, see "About the SM60 Client Software" in this section. The SM60agent, or host-agent management software, provides the communication link between the SM60 client software and the Storage Array.The host-agent management software must be installed on each host connected to the Storage Arrays you want to manage. A management station communicates with a Storage Array through a host running the hostagent software. The host-agent receives requests from the management station and sends them to the controllers in the Storage Array through the Fibre Channel I/O connection. The communication between the management station and the controllers is done through a special volume configured by controllers called an access volume. This volume uses one of the logical unit numbers (LUNs) available on the host. The SM60agent package also contains the SM60devices utility that correlates the volumes you create using the storage management software with their operating system device names. Hosts with the host-agent software installed will be automatically discovered by the storage management software and appear in the Device Tree in the Enterprise Management Window along with their attached Storage Arrays if you choose the Automatic Discovery option. RDAC is an I/O path fail-over driver installed on the host computers that access the Storage Array. Typically, a pair of active controllers is installed in the Storage Array. Each volume in the Storage Array is "owned" by one controller that controls the I/O between the volume and the application host along the I/O path. When a component in the I/O path fails, such as a cable or the controller itself, the RDAC multi-path driver transfers ownership of the volumes assigned to that controller to the other controller in the pair. The RDAC is required to be installed on the host to which the storage array is connected. The RDAC is installed as part of the HP Storage Manager 60 software. MANAGING STORAGE ARRAYS 11