Appeal 2006-2536
Application 10/611,127
one of the requesters has access to only one of the controllers, the invention
designates that controller as the active controller. In response to detecting
that each requester has access only to different ones of the controllers, the
invention designates one of controllers as the active resource controller and
enables requests from only the requester that has access thereto. (Id. 5.)
B. ILLUSTRATIVE CLAIM
Claim 1, which further illustrates the invention, follows.
1. A method for arbitrating a selection of an active storage
controller in a multi-requester storage system having an active-
passive pair of storage controllers in order to avoid potential
logic unit thrashing, said method comprising:
in response to a detection that each of at least two
requesters has usable access to both of said active-passive pair
of storage controllers, selecting any one of said active-passive
pair of storage controllers as an active storage controller;
in response to a detection that one of said at least two
requesters has usable access to only one of said active-passive
pair of storage controllers, selecting said only one of said
active-passive pair of storage controllers as an active storage
controller; and
in response to a detection that each of said at least two
requesters has usable access only to different ones of said
active-passive pair of storage controllers, selecting any one of
said active-passive pair of storage controllers as an active
storage controller.
C. REJECTION
Claims 1-9 stand rejected under 35 U.S.C. § 102(e) as anticipated by
U.S. Patent No. 6,393,535 ("Burton").
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