Under operating system-based naming, all disk devices except fabric mode disks are displayed either using the legacy c#t#d# format or the persistent disk## format. By default, DMP commands display the names of these devices in the legacy format as these correspond to the names of the metanodes that are created by DMP.

The syntax of a legacy device name is c#t#d#, where c# represents a controller on a host bus adapter, t# is the target controller ID, and d# identifies a disk on the target controller.

DMP assigns the name of the DMP meta-device (disk access name) from the multiple paths to the disk. DMP sorts the names by controller, and selects the smallest controller number. For example, c1 rather than c2. If multiple paths are seen from the same controller, then DMP uses the path with the smallest target name. This behavior make it easier to correlate devices with the underlying storage.

If a CVM cluster is symmetric, each node in the cluster accesses the same set of disks. This naming scheme makes the naming consistent across nodes in a symmetric cluster.

By default, OS-based names are not persistent, and are regenerated if the system configuration changes the device name as recognized by the operating system. If you do not want the OS-based names to change after reboot, set the persistence attribute for the naming scheme.