An array is a set of disk drives that the logically groups to provide one or more logical drives to a .
A logical drive is a logical structure that you create on a for data storage. A logical drive is defined over a set of disk drives called an array, and it has a defined level and capacity. The disk drive boundaries of the array are hidden to the host computer.
To better meet your storage needs, you can configure additional logical drive parameters, such as , , cache parameters, and .
A hot spare disk drive contains no data and acts as a standby in case a disk drive fails in a , , , or logical drive. The hot spare disk drive adds another level of to your storage subsystem. If a disk drive fails in the storage subsystem, the hot spare disk drive is automatically substituted for the failed disk drive without requiring a physical swap. If the hot spare disk drive is available when a disk drive fails, the controller will use redundancy data to reconstruct the data from the failed disk drive to the hot spare disk drive. When you have physically replaced the failed disk drive, a operation occurs. If you have designated the hot spare disk drive as a permanent member of an array, the copyback operation is not needed.
A hot spare disk drive is not dedicated to a specific array. Instead, a hot spare disk drive is global and can be used for any failed disk drive in the storage subsystem with the same capacity or smaller capacity.