H3C Technologies H3C S10500 Series Switches - Manual (Page 54)

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Configuring and obtaining FC4 information of
nodes
After a node registers with a switch through a FLOGI, the node sends a name service registration request
to the switch to register extended information, including FC4 information.
FC4 information includes the following fields to describe the FC4-layer protocol supported by a node
and the feature of the supported protocol.
• FC4-Type—FC4-layer protocol supported by a node, including SCSI-FCP, IP, SNMP, and NPV.
• Feature—Feature of the supported FC4-layer protocol. Each FC4-layer protocol can include one of
the four Features and defines the meaning of each Feature.
Before communicating with other nodes, a node obtains information about all nodes that support
SCSI-FCP from the switch. You can use the display fc name-service database command to display the
FC4 information of nodes in the name service database.
When registering extended information:
• A server registers SCSI-FCP for FC4-Type and Initiator for Feature.
• A disk device registers SCSI-FCP for FC4-Type and Target for Feature.
As a result, servers can determine the disk devices to send access requests after obtaining information
about nodes supporting SCSI-FCP.
Enabling SCSI-FCP information autodiscovery
In some situations, for example, when a node logs out and then logs back in, the node does not register
SCSI-FCP support. Therefore, the node does not have a Feature value. This might cause communication
failure between the node and other nodes.
This feature enables the switch to automatically obtain SCSI-FCP support and the Feature value by
sending a PRLI packet to the node that is logging in. Then, the switch stores the SCSI-FCP information in
the name service database.
NOTE:
After this feature is enabled, nodes with older-model HBAs might not actively register name service
information with the switch.
To enable SCSI-FCP information autodiscovery:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VSAN view. vsan vsan-id N/A
3. Enable SCSI-FCP
information autodiscovery.
fc name-service auto-discovery
By default, SCSI-FCP information
autodiscovery is enabled.