updating iSNS registration for portal IP address change

["Paul Hughes" <phughes@xxxxxxxxxxxxxx>]

Title: updating iSNS registration for portal IP address change

I am trying to determine the proper way to update an iSNS server when the IP address of an iSCSI target port changes.  In my case, I have a multi-ported iSCSI target that registers a single Storage Node object and multiple Portal and Portal Group objects.

One method is to re-register the entire Network Entity using DevAttrReg with the replace flag set.  This method seems rather disruptive as SCNs will be generated for the de-registered objects and additional SCNs are generated for registration of the new objects.  I assume this means that iSCSI initiators in the target's Discovery Domain might logout all sessions with the target's portals only to re-login a short time later.  Is this true?  I'd like to avoid causing logouts on any portals that retain their original IP address.

Alternately, I can de-register the Portal object for the old IP address of the target port using DevDereg and then register a new Portal object for the new IP address using DevAttrReg.  However, I don’t believe it's possible to de-register the old Portal Group objects without de-registering the Storage Node object.  In my case, I believe that de-registering the Storage Node object would be as disruptive as doing a replacement registration of the entity, since the target has only one Storage Node object associated with all of its portal groups.

Thanks for any help on this.

Paul

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