Tuesday, 9 February 2016

VMware vsphere iSCSI SAN Discovery Methods


iSCSI supports the following discovery mechanisms:

Static Configuration:


In this method, it is assumed that the IP address, TCP port and the iSCSI target name information are already available to the initiator. The initiators need to perform no discovery in this approach. The initiator uses the IP address and the TCP port information to establish a TCP connection, and it uses the iSCSI target name information to establish an iSCSI session. This discovery option is convenient for small iSCSI setups.

SendTargets (Dynamic Configuration):

This method assumes that the target's IP address and TCP port information are already available to the initiator. The initiator then uses this information to establish a discovery session to the Network Entity. The initiator then subsequently issues the SendTargets text command to query information about the iSCSI targets available at the particular Network Entity (IP address). SendTargets command details can be found in the iSCSI document (RFC3720). This discovery option is convenient for iSCSI gateways and routers.
Zero-Configuration:

This mechanism assumes that the initiator does not have any information about the target. In this option, the initiator can either multicast discovery messages directly to the targets or it can send discovery messages to storage name servers.

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