DMP assigns the name of the DMP meta-device (disk access name) from the multiple paths to the disk. DMP sorts the names by hdisk number, and selects the smallest number. For example, hdisk1 rather than hdisk2.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.