(1) In an RSR environment, an IMS that runs at an active site, performs production work, and is monitored by the tracking IMS. See also tracker.
(2) In an XRF environment, an IMS that performs production work and is monitored by the alternate IMS. See also alternate IMS.
(3) If FDBR is used, the IMS that performs production work. The active IMS is monitored by a separate Fast Database Recovery IMS control region.