- Index
- Preface
- Product Overview
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- Configuring Ethernet Interfaces
- Configuring VLANs
- Configuring Private VLANs
- Configuring Rapid PVST+
- Configuring Multiple Spanning Tree
- Configuring STP Extensions
- Configuring Port Channels
- Configuring Access and Trunk Interfaces
- Configuring the MAC Address Table
- Configuring IGMP Snooping
- Configuring Traffic Storm Control
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- Configuring Fibre Channel Interfaces
- Configuring Domain Parameters
- Configuring N-Port Virtualization
- Configuring VSAN Trunking
- Configuring SAN PortChannels
- Configuring and Managing VSANs
- Configuring and Managing Zones
- Distributing Device Alias Services
- Configuring Fibre Channel Routing Services and Protocols
- Managing FLOGI, Name Server, FDMI, and RSCN Databases
- Discovering SCSI Targets
- Advanced Features and Concepts
- Configuring FC-SP and DHCHAP
- Configuring Port Security
- Configuring Fabric Binding
- Configuring Fabric Configuration Servers
- Configuring Port Tracking
Discovering SCSI Targets
This chapter describes the SCSI LUN discovery feature provided in switches in the Cisco Nexus 5000 Series. It includes the following sections:
Information 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 that a Network Management System (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 Nexus 5000 Series.
This section includes the following topics:
- About Starting SCSI LUN Discovery
- Starting SCSI LUN Discovery
- About Initiating Customized Discovery
- Initiating Customized Discovery
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, perform this task:
The following example discovers local SCSI targets for all operating systems (OSs):
The following example discovers remote SCSI targets assigned to the AIX OS:
The following example discovers SCSI targets for VSAN 1 and FC ID 0x9c03d6:
The following example discovers SCSI targets from the customized list assigned to the Linux OS:
About Initiating Customized Discovery
Customized discovery consists of a list of VSAN and domain pairs that are selectively configured to initiate a discovery. Use the custom-list option to initiate this discovery. The domain ID is a number from 0 to 255 in decimal or a number from 0x0 to 0xFF in hex.
Initiating Customized Discovery
To initiate a customized discovery, perform this task:
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switch# discover custom-list add vsan vsan-id domain domain-id |
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switch# discover custom-list delete vsan vsan-id domain domain-id |
Displaying SCSI LUN Information
Use the show scsi-target and show fcns database commands to display the results of the discovery.
The following example displays the discovered targets:
Note
This command takes several minutes to complete, especially if the fabric is large or if several devices are slow to respond.
The following example displays the FCNS database:
The following example displays the SCSI target disks:
The following example displays the discovered LUNs on all operating systems:
The following example displays the port WWN that is assigned to each operating system (Windows, AIX, Solaris, Linux, or HPUX):
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