Storage apparatus, and computer-readable recording medium having stored therein storage apparatus control program

Patent metadata

Field	Value
Publication number	US-2016188246-A1
Application number	US-201514938898-A
Country	US
Kind code	A1
Filing date	Nov 12, 2015
Priority date	Dec 24, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

A storage apparatus includes a processor, in which the processor determines presence/absence of an input/output request that is in a standby state for each of a plurality of storage devices, arranges first storage devices, for which the input/output request that is in the standby state is determined to be present, among the plurality of storage devices in order determined based on priority levels set according to processing bandwidth values of the first storage devices, and executes bandwidth accommodation from at least one second storage device having a bandwidth to spare among the plurality of storage devices to the first storage devices in order of the arrangement of the first storage devices. Accordingly, even when the bandwidth accommodation is performed, an occurrence of bandwidth reversal between storage devices having mutually-different priority levels can be suppressed.

First claim

What is claimed is:

1 . A storage apparatus comprising a processor:
the processor determines presence/absence of an input/output request that is in a standby state for each of a plurality of storage devices; arranges first storage devices, for which the input/output request that is in the standby state is determined to be present, among the plurality of storage devices in order determined based on priority levels set according to processing bandwidth values of the first storage devices; and executes bandwidth accommodation from at least one second storage device having a bandwidth to spare among the plurality of storage devices to the first storage devices in order of the arrangement of the first storage devices.

2 . The storage apparatus according to claim 1 , wherein the processor calculates, for each priority level of at least one target storage device that receives the input/output request among the plurality of storage devices, an upper limit of an accommodation amount from the at least one second storage device to the first storage device, based on the processing bandwidth value corresponding to the priority level of the at least one target storage device, and
the processor executes the bandwidth accommodation corresponding to the upper limit from the at least one second storage device to the first storage device in a case where the upper limit calculated for the priority level of the first storage device is a sum of the bandwidth to spare of the at least one second storage device or less.

3 . The storage apparatus according to claim 2 , wherein the processor sets, for each of the priority levels of the plurality of storage devices, a value acquired by multiplying the processing bandwidth value corresponding to the priority level by a predetermined number that is larger than “one” as an initial value of the upper limit,
the processor calculates the initial value as the upper limit in a case where a target storage device having a priority level higher than the priority level of the at least one target storage device is not present or in a case where the initial value for the priority level is the processing bandwidth value of the target storage device having a priority level higher than the priority level or less, and
the processor calculates the processing bandwidth value as the upper limit in a case where the initial value for the priority level is larger than the processing bandwidth value of the target storage device having a priority level higher than the priority level.

4 . The storage apparatus according to claim 1 , wherein each of the plurality of storage devices is one of a plurality of logic units acquired by logically dividing one or more physical storage devices.

5 . A non-transitory computer-readable recording medium having a storage apparatus control program stored thereon, the storage apparatus control program causing a computer included in the storage apparatus to execute:
determining presence/absence of an input/output request that is in a standby state for each of a plurality of storage devices to which priority levels according to processing bandwidth values are set; arranging first storage devices, for which the input/output request that is in the standby state is determined to be present, among the plurality of storage devices in order determined based on the priority levels; and executing bandwidth accommodation from at least one second storage device having a bandwidth to spare among the plurality of storage devices to the first storage devices in order of the arrangement of the first storage devices.

6 . The non-transitory computer-readable recording medium according to claim 5 , wherein the storage apparatus control program causing the computer to further execute:
calculating, for each priority level of at least one target storage device that receives the input/output request among the plurality of storage devices, an upper limit of an accommodation amount from the at least one second storage device to the first storage device, based on the processing bandwidth value corresponding to the priority level of the at least one target storage device; and executing the bandwidth accommodation corresponding to the upper limit from the at least one second storage device to the first storage device in a case where the upper limit calculated for the priority level of the first storage device is a sum of the bandwidth to spare of the at least one second storage device or less.

7 . The non-transitory computer-readable recording medium according to claim 6 , wherein the storage apparatus control program causing the computer to further execute:
setting, for each of the priority levels of the plurality of storage devices, a value acquired by multiplying the processing bandwidth value corresponding to the priority level by a predetermined number that is larger than “1” as an initial value of the upper limit; calculating the initial value as the upper limit in a case where a target storage device having a priority level higher than the priority level of the at least one target storage device is not present or in a case where the initial value for the priority level is the processing bandwidth value of the target storage device having a priority level higher than the priority level or less; and calculating the processing bandwidth value as the upper limit in a case where the initial value for the priority level is larger than the processing bandwidth value of the target storage device having a priority level higher than the priority level.

8 . The non-transitory computer-readable recording medium according to claim 5 , wherein each of the plurality of storage devices is one of a plurality of logic units acquired by logically dividing one or more physical storage devices.

Assignees

• Fujitsu Ltd

Inventors

• Makida Toshiharu
• Sugioka Kiyoshi
• Bita Joichi

Classifications

• G06F3/0659

  Command handling arrangements, e.g. command buffers, queues, command scheduling · CPC title

• G06F3/0689

  Disk arrays, e.g. RAID, JBOD · CPC title

• G06F3/061 Primary

  Improving I/O performance · CPC title

• G06F3/0683

  Plurality of storage devices · CPC title

• G06F3/0604

  Improving or facilitating administration, e.g. storage management · CPC title