US 7,454,656 B2Granted

Storage device and storage device power consumption control method

AssigneeHitachi, Ltd.

InventorsNaoki Okada, Kenji Mori, Nobuyuki Minowa

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Abstract

According to the present invention, in cases where a CHA function and a DKA function are mounted within a single package, a battery power supply that is used during the occurrence of power supply trouble is effectively utilized so that the supply of power can be separately controlled for each function. A CHA part and DKA part are disposed in a single control package. When trouble such as a power outage is detected, the CHA part blocks access requests from the host, and initiates end processing. When the end processing of the CHA part is completed, the package internal power supply control part stops the clock supply to the CHA part. Then, when the DKA part completes destage processing, the package internal power supply control part stops the supply of power to the DKA part. The power consumption of the package is lowered in stages in accordance with the progress of the end processing.

Claims17

Dependent claims

The storage device comprising:

a communications control part that is coupled to host devices and storage devices, and that controls the exchange of data with said host devices and said storage devices;
a memory part that is used in said communications control part;
and
a device power supply part that supplies a specified power to said communications control part and said memory part,
wherein said communications control part comprises a host interface control part that controls the exchange of data with said host devices, a slave interface control part that controls the exchange of data with said memory devices, and an internal power supply control part that controls the supply of power to said host interface control part and slave interface control part,
in cases where trouble is detected in the supply of power to said communications control part by the device power supply part, said communications control part separately controls the supply of power to said host interface control part and said slave interface control part in accordance with the respective states of execution of first end processing that is performed by said host interface control part and second end processing that is performed by said slave interface control part, and
said internal power supply control part stops supplying power to said communications control part after said host interface control part has completed said first end processing and said slave interface control part has completed said second end processing,
said first end processing is processing that blocks access requests from said host devices, and that causes unprocessed access requests to be reflected in the memory part, and said second end processing is processing that causes specified data held in said memory part to be saved in said storage devices, and
in cases where trouble is detected in the supply of power to said communications control part, said device power supply part judges whether a level of this power supply trouble is a light level or serious level, and notifies said communications control part of the level, and said communications control part
(1) stops a clock supply to said host interface control part after said first end processing is completed, and stops a clock supply to said slave interface control part after said second end processing is completed, in cases where said notified level of the power supply trouble is said light level, and
(2) stops the supply of power to said host interface control part after said first end processing is completed, and stops the supply of power to said slave interface control part after said second end processing is completed, in cases where said notified level of the power supply trouble is said serious level.

8 more elements

The storage device comprising:

a communications control part that is coupled to host devices and storage devices, and that controls the exchange of data with said host devices and said storage devices;
a memory part that is used in said communications control part;
and
a device power supply part that supplies a specified power to said communications control part and said memory part,
wherein said communications control part comprises a host interface control part that controls the exchange of data with said host devices, a slave interface control part that controls the exchange of data with said memory devices, and an internal power supply control part that controls the supply of power to said host interface control part and slave interface control part,
in cases where trouble is detected in the supply of power to said communications control part by the device power supply part, said communications control part separately controls the supply of power to said host interface control part and said slave interface control part in accordance with the respective states of execution of first end processing that is performed by said host interface control part and second end processing that is performed by said slave interface control part, and
said internal power supply control part stops supplying power to said communications control part after said host interface control part has completed said first end processing and said slave interface control part has completed said second end processing,
said first end processing is processing that blocks access requests from said host devices, and that causes unprocessed access requests to be reflected in the memory part, and said second end processing is processing that causes specified data held in said memory part to be saved in said storage devices, and
a plurality of said communications control parts are provided,
in cases where other trouble occurs while the slave interface control part belonging to one of said plurality of communications control parts is executing said second end processing, this second end processing that is in execution is interrupted, and
said interrupted second end processing is restarted by the slave interface control part belonging to another of said plurality of communications control parts.

8 more elements

A storage device comprising:

a disk drive group for storing data;
one or more communications control packages that respectively control the exchange of data with said disk drive group and host devices;
a cache memory that is utilized by said communications control packages;
and
a device power supply part that supplies a specified power to said disk drive group, said communications control packages and said cache memory;
wherein said device power supply part comprises a main power supply and a battery power supply that operates when this main power supply stops,
said communications control packages comprise a channel adapter part that controls the exchange of data with said host devices, a disk adapter part that controls the exchange of data with said disk drive group, and a package internal power supply control part that controls the supply of power to said channel adapter part and said disk adapter part,
said device power supply part switches from said main power supply to said battery power supply in cases where said device power supply part detects a power outage state of said main power supply,
said channel adapter part initiates first end processing, blocks access requests from said host devices, and writes unprocessed access requests into said cache memory in cases where the power supply is switched from said main power supply to said battery power supply,
said disk adapter part initiates second end processing and writes the data that is stored in said cache memory into said disk drive group after said first end processing that is performed by said channel adapter part has been completed, and
said package internal power supply control part
(1) lowers the amount of power consumption of said channel adapter part by stopping a clock supply to said channel adapter part after said channel adapter part has completed said first end processing, and
(2) lowers the amount of power consumption of said disk adapter part by stopping the supply of power to said disk adapter part after said disk adapter part has completed said second end processing.

10 more elements

A storage device power consumption control method which is a method for controlling the power consumption of a storage device which comprises a disk drive group for storing data;

one or more communications control packages that respectively control the exchange of data with said disk drive group and host devices;
a cache memory that is utilized by said communications control packages;
and
a device power supply part that supplies a specified power to said disk drive group, said communications control packages and said cache memory;
and in which said device power supply part comprises a main power supply and a battery power supply that operates when this main power supply stops, and
said communications control packages comprise a channel adapter part that controls the exchange of data with said host devices, a disk adapter part that controls the exchange of data with said disk drive group, and a package internal power supply control part that controls the supply of power to said channel adapter part and said disk adapter part, this method comprising the steps of:
judging whether or not a power outage state has occurred in said main power supply;
switching from said main power supply to said battery power supply in cases where it is judged that a power outage state has occurred in said main power supply;
notifying said channel adapter part that the power supply has been switched from said main power supply to said battery power supply;
blocking access requests from said host devices by said channel adapter part that has received this notification;
writing unprocessed access requests into said cache memory by said channel adapter part that has blocked access requests from said host devices;
notifying said package internal power supply control part of the completion of writing of said unprocessed access requests into said cache memory by said channel adapter part;
stopping a clock supply to said channel adapter part by said package internal power supply control part that has received this notification;
sending a notification to said disk adapter part by said package internal power supply control part that has stopped the clock supply to said channel adapter part;
saving write data stored in said cache memory in said disk drive group by said disk adapter part that has received this notification;
sending a notification to said package internal power supply control part by said disk adapter part that the saving of said write data in said disk drive group has been completed;
stopping the supply of power to said communications control package by said package internal power supply control part that has received this notification, and sending a notification to said device power supply part indicating that the supply of power to the package as a whole has been stopped;
and
supplying power only to said cache memory by said device power supply part that has received this notification, so that data stored in said cache memory is held.

16 more elements

Dependencies are inferred from the claim text.