Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2006-09-07
2009-12-01
Bragdon, Reginald G (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S165000
Reexamination Certificate
active
07627729
ABSTRACT:
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.
REFERENCES:
patent: 2003/0126107 (2003-07-01), Yamagami et al.
patent: 2004/0230859 (2004-11-01), Cochran et al.
patent: 2004/0260899 (2004-12-01), Kern
patent: 2005/0081091 (2005-04-01), Bartfai et al.
patent: 2005/0193245 (2005-09-01), Hayden et al.
Bartfai Robert Francis
Clayton Nicolas Marc
Fienblit Shachar
Gluck Olympia
Malul Eli
Bragdon Reginald G
International Business Machines - Corporation
Kunzler & McKenzie
Loonan Eric
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