iSCSI
initiators can discover iSCSI targets using four different methods, as outlined
in the following table:
|
Discovery mechanism
|
Description
|
|
Send Targets
|
• The iSCSI Initiator performs an iSCSI discovery login and
then a SendTargets operation on portals (where a portal is a target’s IP and
TCP port number pair) that are statically configured in the iSCSI Initiator
properties on the Discovery tab or by using the iscsicli AddTargetPortal command.
Discovery occurs under three conditions:
• When a target portal is added.
• When the service starts.
• When a management application requests it.
|
|
Internet Storage Name Service (iSNS)
|
• You need to set a static address for the iSNS server by
using the iscsicli AddiSNSServer command. The iSCSI initiator gets a
list of targets under three conditions:
• When the service starts.
• When an application requests it.
• When the iSNS server sends a state notification change.
|
|
Manually configured targets
|
iSCSI targets can be manually configured in the iSCSI
Initiator properties on the Targets tab or by using the iscsicli AddTarget
command. Manually configured targets are persistent. Those targets that
are not configured as Hidden are available whenever the service restarts.
|
|
HBA discovery
|
iSCSI HBAs that conform to interfaces in iSCSI Initiator
can perform target discovery through the interface between the HBA and the
iSCSI Initiator service. The HBA will respond to requests from the iSCSI
Initiator to send a list of targets. The iSCSI Initiator will make this
request when the service starts or when the HBA tells the iSCSI Initiator
that the list has changed
|
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