Physical Disk Naming for SAN

We can  locate and access the data on a physical disk by using a device name that specifies the controller, target ID, and disk number. 

A typical device name uses the format: c#t#d#.

• c# is the controller number. 
• t# is the target ID. 
• d# is the logical unit number (LUN) of the drive attached to the target. 

If a disk is divided into partitions, then we also specify the partition number in the device name:

s# is the partition (slice) number. 

For example, device name c0t0d0s1 is connected to controller number 0 in the system, with a target ID of 0, physical disk number 0, and partition number 1 on the disk.