Logical Resources are all of the resources defined on the ASC Server, including physical SAN Resources (virtual drives, service-enabled devices, and direct devices) NAS Resources, Replica Resources, Snapshot Groups, and BMR Resources.

Clients do not gain access to physical resources; they only have access to Logical Resources.  This means than an administrator must configure each physical resource to one or more Logical Resources so that they can be assigned to the Clients.

Logical Resources consist of sets of storage blocks from one or more physical hard disk drives. This allows the creation of Logical Resources that contain a portion of a larger physical disk device or an aggregation of multiple physical disk devices. 

This example illustrates three Logical Resources being created from a single large RAID drive. 

This example illustrates three physical drives (e.g. JBOD) being combined to form a single Logical Resource. With this configuration, it is easy to expand the Logical Resource by adding more physical drives. 

To facilitate smooth migration, storage can also be "direct-mapped" so that any pre-existing drive or RAID cabinet with existing data/volumes can be mapped "verbatim". Direct Device Logical Resources preserve all of the existing partitions and data of the physical drive.  This feature eliminates the traditional laborious tasks of backing up and/or copying of existing data when migrating data from the "Local Attached" model to your SAN.