CHAPTER 10
Discovering SCSI Targets
This chapter describes the SCSI LUN discovery feature provided in switches in the Cisco MDS 9000 Family.
It includes the following sections:
• About SCSI LUN Discovery, on page 239
• Displaying SCSI LUN Information, on page 241
About SCSI LUN Discovery
Small Computer System Interface (SCSI) targets include disks, tapes, and other storage devices. These targets
do not register logical unit numbers (LUNs) with the name server.
The name server requires LUN information for the following reasons:
• To display LUN storage device information so an NMS can access this information.
• To report device capacity, serial number, and device ID information.
• To register the initiator and target features with the name server.
The SCSI LUN discovery feature uses the local domain controller Fibre Channel address. It uses the local
domain controller as the source FC ID, and performs SCSI INQUIRY, REPORT LUNS, and READ CAPACITY
commands on SCSI devices.
The SCSI LUN discovery feature is initiated on demand, through CLI or SNMP. This information is also
synchronized with neighboring switches, if those switches belong to the Cisco MDS 9000 Family.
This section includes the following topics:
About Starting SCSI LUN Discovery
SCSI LUN discovery is done on demand.
Only Nx ports that are present in the name server database and that are registered as FC4 Type = SCSI_FCP
are discovered.
Starting SCSI LUN Discovery
To start SCSI LUN discovery, follow one of these steps:
Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x
239
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