In the vSphere Client, each storage device, or LUN, is identified by several names.

Name

A friendly name that the host assigns to a device based on the storage type and manufacturer. You can modify the name using the vSphere Client.

Identifier

A universally unique identifier that the host extracts from the storage. Depending on the type of storage, the host uses different algorithms to extract the identifier.

Runtime Name

The name of the first path to the device. The runtime name is created by the host. The runtime name is not a reliable identifier for the device, and is not persistent.

The runtime name has the following format:

vmhba#:C#:T#:L#, where

vmhba# is the name of the storage adapter. The name refers to the physical adapter on the host, not to the SCSI controller used by the virtual machines.

C# is the storage channel number.

Software iSCSI initiators use the channel number to show multiple paths to the same target.

T# is the target number. Target numbering is decided by the host and might change if there is a change in the mappings of targets visible to the host. Targets that are shared by different hosts might not have the same target number.

L# is the LUN number that shows the position of the LUN within the target. The LUN number is provided by the storage system. If a target has only one LUN, the LUN number is always zero (0).

For example, vmhba1:C0:T3:L1 represents LUN1 on target 3 accessed through the storage adapter vmhba1 and channel 0.