Use of Logical Unit Numbers (LUNs) With SCSI Disks
You must configure your SCSI disks in your disk controller. A SCSI disk in a disk controller is called a Logical Unit Number (LUN).
z/VSE views
SCSI disks as FBA disks. Therefore, for each LUN you must add a corresponding
FBA device to your z/VSE IPL
procedure, as described in Adding a Disk, Tape, or Printer Device.
Note: An
FBA device must not exist in the IOCDS.
You must use a connection path to link each FBA device to a SCSI disk (LUN), as described in Defining FCP Devices, SCSI Disks and Connection Paths to z/VSE.
z/VSE’s SCSI support can use LUNs that have been configured in any of the supported disk controllers.
Configuring LUNs in XIV®, SVC, or Storwize® disk systems:
- LUNs in XIV, SVC, or Storwize disk systems are represented by decimal numbers.
- LUNs used in z/VSE are represented by hexadecimal numbers.
- Each decimal LUN must therefore be translated into a hexadecimal number. A LUN in XIV, SVC or Storwize
must be defined in z/VSE as a 2-bytes LUN. For
example: LUN number
12
would be translated in z/VSE toLUN=000C
orLUN=000C000000000000
.