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Ghost device handles in AIX cause longer return time on iSCSI commands

Querying AIX devices through iSCSI or FC that have ghost device handles (devices handles in a defined or failed state) can cause SCSI commands to wait for the AIX default timeout which is about 30 seconds.

You can see this issue after switching an AIX system from using FC to using iSCSI if FC child device handles are not cleaned up or a FC HBA is left not attached to a switch.