Storage controlling apparatus, recording medium for recording storage control program and storage controlling method

Patent metadata

Field	Value
Publication number	US-10725665-B2
Application number	US-201815961938-A
Country	US
Kind code	B2
Filing date	Apr 25, 2018
Priority date	Apr 28, 2017
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

A storage controlling apparatus, includes: a memory configured to store a program; and a processor configured to control a plurality of storage devices based on the program, wherein the processor: collects information relating to a data access performed for the plurality of storage devices; and decides performance degradation of a first storage device from among the plurality of storage devices based on a response achievement time period for a first data access request performed for the first storage device, and a response time period average value and a response time period standard deviation which are calculated based on response achievement time periods with respect to a plurality of data access requests performed for the first storage device before the first data access request.

First claim

What is claimed is:

1. A storage controlling apparatus, comprising:
an interface configured to be coupled to a plurality of storage devices in a first storage group;
a memory; and
a processor coupled to the memory and the interface, the processor configured to:
collect, in each of a first period of time, for each of the plurality of storage devices, log information including a plurality of first response time periods for data accesses each from a first time point to a second time point, the first time point being a time point when a first data access request is issued to an associated storage device from among the plurality of storage devices, the second time point being a time point when a response against the first data access request is received from the associated storage device;
calculate, in each of the first period of time, an average time period of the plurality of first response time periods;
obtain, in each of a second period of time, a latest average time period and a past average time period which is calculated before the second period time from among calculated average time periods;
determine whether a conditional expression based on the latest average time period, the past average time period and a standard deviation is satisfied;
calculate, when determining that the conditional expression is satisfied, a new standard deviation based on a plurality of second response time periods which are collected in the latest second period time;
use, when determining that the conditional expression is not satisfied, the standard deviation as the new standard deviation;
obtain a response time period based on an access request for one of the plurality of storage devices;
determine whether the response time period is longer than the past average time period;
determine, when the response time period is longer than the past average tome period, whether the response time period is longer than a first value obtained by adding the past average time period and three time the new standard deviation;
determine, when the response time period is longer than the first value, whether the response time period is longer than a second value obtained by adding the past average time period of a second storage group different from the first storage group and three time the new standard deviation of the second storage group;
determine performance degradation of the one of the plurality of storage devices when the response time period is longer than the second value;
count up a count value of a counter when the response time period is longer than the second value; and
detach the one of the plurality of storage devices from the first storage group after saving data of the one of the plurality of storage devices into a spare disk,
the first storage group and the second data group are a redundant array of inexpensive disks,
the conditional expression is that the latest average time period is longer than a value obtained by adding the past average time period and three times the standard deviation.

2. A non-transitory computer-readable recording medium recording a storage controlling program causing a computer to perform a processing, the computer comprising an interface configured to be coupled to a plurality of storage devices in a first storage group and a processor coupled to the interface, the processing comprising:
collecting, in each of a first period of time, for each of the plurality of storage devices, log information including a plurality of first response time periods for data accesses each from a first time point to a second time point, the first time point being a time point when a first data access request is issued to an associated storage device from among the plurality of storage devices, the second time point being a time point when a response against the first data access request is received from the associated storage device;
calculating, in each of the first period of time, an average time period of the plurality of first response time periods;
obtaining, in each of a second period of time, a latest average time period and a past average time period which is calculated before the second period time from among calculated average time periods;
determining whether a conditional expression based on the latest average time period, the past average time period and a standard deviation is satisfied;
calculating, when determining that the conditional expression is satisfied, a new standard deviation based on a plurality of second response time periods which are collected in the latest second period time;
using, when determining that the conditional expression is not satisfied, the standard deviation as the new standard deviation;
obtaining a response time period based on an access request for one of the plurality of storage devices;
determining whether the response time period is longer than the past average time period;
determining, when the response time period is longer than the past average tome period, whether the response time period is longer than a first value obtained by adding the past average time period and three time the new standard deviation;
determining, when the response time period is longer than the first value, whether the response time period is longer than a second value obtained by adding the past average time period of a second storage group different from the first storage group and three time the new standard deviation of the second storage group;
determining performance degradation of the one of the plurality of storage devices when the response time period is longer than the second value;
counting up a count value of a counter when the response time period is longer than the second value; and
detaching the one of the plurality of storage devices from the first storage group after saving data of the one of the plurality of storage devices into a spare disk,
the first storage group and the second data group are a redundant array of inexpensive disks,
the conditional expression is that the latest average time period is longer than a value obtained by adding the past average time period and three times the standard deviation.

3. A storage controlling method performed by a computer, the computer including an interface configured to be coupled to a plurality of storage devices in a first storage group and a processor coupled to the interface, the method comprising:
collecting, in each of a first period of time, for each of the plurality of storage devices, log information including a plurality of first response time periods for data accesses each from a first time point to a second time point, the first time point being a time point when a first data access request is issued to an associated storage device from among the plurality of storage devices, the second time point being a time point when a response against the first data access request is received from the associated storage device;
calculating, in each of the first period of time, an average time period of the plurality of first response time periods;
obtaining, in each of a second period of time, a latest average time period and a past average time period which is calculated before the second period time from among calculated average time periods;
determining whether a conditional expression based on the latest average time period, the past average time period and a standard deviation is satisfied;

calculating, when determining that the conditional expression is satisfied, a new standard deviation based on a plurality of second response time periods which are collected in the latest second period time;
using, when determining that the conditional expression is not satisfied, the standard deviation as the new standard deviation;
obtaining a response time period based on an access request for one of the plurality of storage devices;
determ

Assignees

• Fujitsu Ltd

Inventors

• Abe Marie
• Nimura Koutarou
• Imamura Hiroshi

Classifications

• G06F11/3476 Primary

  Data logging (G06F11/14, G06F11/2205 take precedence) · CPC title

• G06F11/0727

  in a storage system, e.g. in a DASD or network based storage system (drivers for digital recording or reproducing units G06F3/06; circuits for error detection or correction within digital recording or reproducing units G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097) · CPC title

• G06F11/3034

  where the computing system component is a storage system, e.g. DASD based or network based (digital input from or digital output to record carriers G06F3/06; digital recording or reproducing G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097) · CPC title

• G06F11/1076

  Parity data used in redundant arrays of independent storages, e.g. in RAID systems · CPC title

• G06F3/0644

  Management of space entities, e.g. partitions, extents, pools · CPC title