Storage apparatus and disk device control method
AssigneeHitachi, Ltd.
InventorNorihiko Kawakami
Life of this patent
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Abstract
In a storage apparatus, an MPU acquires a value of power capable of being used to transition a HDD from a power-saving state to an access-enabled state, receives an access command via a host I/F, determines whether or not it is possible to respond to the access command using one or more HDD in the access-enabled state from among the HDD configuring a LU, and when it is determined that it is possible to respond, selects, from HDD in the power-saving state in the access command-targeted LU, one or more HDD, which are capable of transitioning to the access-enabled state using power in a range of usable power values, and which can make a response possible, as a target to be preferentially transitioned to the access-enabled state.
Claims9
A storage apparatus, which can control access targeted at a logical unit configured from a plurality of disk devices, the disk drives configuring a RAID group, comprising:
- a receiving unit that receives an access command targeting a storage area of the logical unit;
- a state determination unit that determines whether or not a response to the access command can be made via one or more access-enabled disk devices of the plurality of disk devices configuring the logical unit;
- a power value acquisition unit, in response to a determination that the response to the access command cannot be made because the disk drives are in a power-saving state, acquires a value of power capable of being used to spin up all of disk devices in the RAID group;
- and
- a selection unit that if the value of power by the power value acquisition unit is within a range of usable power values, selects all of the disk drives in the power-saving state to spin up, otherwise selects less than all the disk drives to make the response to spin up from all of the disk drives in a power-saving state in ascending order according to their spin-up times;
- and
- wherein the number of the disk drives necessary to make the response to spin up is determined based on redundancy of the RAID group.
A disk device control method of a storage apparatus, which can control access targeted at a logical unit configured from a plurality of disk devices, the disk devices configuring a RAID group,
- the method comprising:
- a receiving step of receiving an access command that targets a storage area of the logical unit;
- a state determination step of determining whether or not it is possible to respond to the access command using one or more disk devices in the access-enabled state from among the plurality of disk devices configuring the logical unit;
- a power acquisition step of, in response to the determination that the response to the access command cannot be made because the disk drives are in a power-saving state, acquiring a value of power capable of being used to spin up all of disk devices in the RAID group;
- a selection step of, if the value of power by the power value acquisition unit is within a range of usable power values, selecting all of the disk drives in the power-saving state to spin up, otherwise, selecting less than all the disk drives to make the response to spin up from all of the disk drives in a power-saving state in ascending order according to their spin-up times,
- wherein the number of the disk drives necessary to make the response to spin up is determined based on redundancy of the RAID group.
Dependencies are inferred from the claim text.