Operating system-based naming

In the OS-based naming scheme, all disk devices are named using the c#t#d#s# format.

The syntax of a device name is c#t#d#s#, where c# represents a controller on a host bus adapter, t# is the target controller ID, d# identifies a disk on the target controller, and s# represents a partition (or slice) on the disk.


For non-EFI disks, the slice s2 represents the entire disk. For both EFI and non-EFI disks, the entire disk is implied if the slice is omitted from the device name.

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.

The boot disk (which contains the root file system and is used when booting the system) is often identified to VxVM by the device name c0t0d0.

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.

More Information

Changing the disk-naming scheme