Reducing Power Consumption of Mirrored RAID Subsystems
AssigneeInternational Business Machines Corporation
InventorsJens-Peter Akelbein, Rainer Wolafka
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Abstract
Power consumption reduction of a mirrored RAID storage subsystems is disclosed, wherein data are mirrored to a secondary mirror disk system, the secondary mirror disk system alternates between an operational stage and a power-save stage, wherein data to be mirrored to the secondary mirror disk system is saved in a substantially always operational pre-stage storage if the secondary mirror disk system is in a power save stage and subsequently moved from the pre-stage storage to the secondary mirror disk system when the secondary mirror disk system is operational.
Claims18
A method for reducing the power consumption of storage subsystems, wherein data are mirrored from a primary disk subsystem to a secondary mirror disk subsystem, the secondary mirror subsystem alternating between an operational phase and a power save phase according to a predetermined plan, the method comprising:
- responsive to said secondary mirror disk subsystem being in said power-save phase, mirroring primary disk subsystem data to a pre-stage storage according to a predetermined mirroring policy, the pre-stage storage configured to be substantially permanently operational;
- and
- responsive to a predetermined event, moving said mirrored primary disk subsystem data from said pre-stage storage to said secondary mirror disk subsystem.
A controller for reducing the power consumption of storage subsystems, wherein data are mirrored from a primary disk subsystem (16) to a secondary mirror disk subsystem, the secondary mirror subsystem alternating between an operational phase and a power save phase according to a predetermined plan, the controller for performing a method comprising:
- responsive to said secondary mirror disk subsystem being in said power-save phase, mirroring primary disk subsystem data to a pre-stage storage according to a predetermined mirroring policy, the pre-stage storage configured to be substantially permanently operational;
- and
- responsive to a predetermined event, moving said mirrored primary disk subsystem data from said pre-stage storage to said secondary mirror disk subsystem.
A computer program product for reducing the power consumption of storage subsystems, wherein data are mirrored from a primary disk subsystem to a secondary mirror disk subsystem, the secondary mirror subsystem alternating between an operational phase and a power save phase according to a predetermined plan, comprising a computer useable medium including computer readable code, wherein the computer readable code when executed on a computer causes the computer to perform the method comprising:
- responsive to said secondary mirror disk subsystem being in said power-save phase, mirroring primary disk subsystem data to a pre-stage storage according to a predetermined mirroring policy, the pre-stage storage configured to be substantially permanently operational;
- and
- responsive to a predetermined event, moving said mirrored primary disk subsystem data from said pre-stage storage to said secondary mirror disk subsystem.
Dependencies are inferred from the claim text.