An apparatus, system, and method are disclosed for activating a
synchronous mirror as a primary storage volume. The apparatus system and
method include directing a third storage volume to store updates sent to
the third storage volume from a second storage volume onto a first
storage volume in response to the first storage volume becoming
operational after a failure, terminating sending updates from the second
storage volume to the third storage volume in response to the first
storage volume becoming substantially consistent with the third storage
volume, and synchronously storing updates received by the second storage
volume on the first storage volume and asynchronously storing updates
received by the first storage volume on the third storage volume in
response to terminating sending updates from the second storage volume to
the third storage volume after the first and third storage volumes are
substantially consistent.