# US 2013/0159562 A1 · Storage system, control device, and storage system control method of controlling storage system

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- Number: US 2013/0159562 A1
- Document ID: US20130159562A1
- Status: Published application
- Kind: A1
- Application number: 13/675,004
- Filed: 2012-11-13
- Published: 2013-06-20
- Earliest claimed: 2011-12-19
- Assignees: Fujitsu Limited
- Inventors: Shun ANDO
- Web page: https://patentgrep.com/patent/US20130159562A1

## CPC

- G06F 11/0778: {Dumping, i.e. gathering error/state information after a fault for later diagnosis}
- G06F 11/0727: {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)}
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A storage system includes a disk and a CM. The CM includes a main control unit and a sub control unit that distribute and execute processing in the CM. Further the CM includes a plurality of CAs that receive commands related to the input and the output of the data stored in the disk from a host computer. The main control unit requests the sub control unit to copy dump data of a first CA among the plurality of CAs when detecting abnormality of the first CA while copying dump data of a second CA among the plurality of CAs according to abnormality of the second CA.

## Claims

### Claim 1

A storage system comprising:
a memory device that stores data; and
a control device that controls an input and an output of data to and from the memory device, the control device including
a first processing unit and a second processing unit that distribute and execute processing in the control device; and
a plurality of interface units that receive commands related to the input and the output of the data stored in the memory device from an external device,
the first processing unit requests the second processing unit to copy dump data of a first interface unit among the plurality of interface units when detecting abnormality of the first interface unit while copying dump data of a second interface unit among the plurality of interface units according to abnormality of the second interface unit.

### Claim 2 (depends on 1)

The storage system according to claim 1, wherein
the first processing unit requests, when further detecting abnormality of a third interface unit among the plurality of interface units, a processing unit of an external control device to copy dump data of the third interface unit.

### Claim 3 (depends on 2)

The storage system according to claim 2, wherein
the first processing unit selects, when there is a plurality of external control devices each with a processing unit, one processing unit which copies data of the third interface unit in a shorter time than a predetermined time and whose processing time, calculated based on a number of commands related to the input and the output, is shortest among the processing units of the external control devices, and requests the selected processing unit to copy the dump data of the third interface unit.

### Claim 4 (depends on 3)

The storage system according to claim 3, wherein
the first processing unit selects, when none of the processing units copies the data of the third interface unit in a shorter time than the predetermined time, a processing unit whose processing time calculated based on the number of commands related to the input and the output is shortest among the processing units.

### Claim 5

A control device that controls an input and an output of data to and from a memory device that stores data, the control device comprising:
a first processing unit and a second processing unit that distribute and execute processing in the control device; and
a plurality of interface units that receive commands related to the input and the output of the data stored in the memory device from an external device,
the first processing unit requests the second processing unit to copy dump data of a first interface unit of the plurality of interface units, when detecting abnormality of the first interface unit while copying dump data of a second interface unit among the plurality of interface units according to abnormality of the second interface unit.

### Claim 6

A method of controlling a storage system that includes a memory device and a control device, the method comprising:
copying, by a first processing unit of the control device, dump data of a first interface unit, when detecting abnormality of the first interface unit among a plurality of interface units, the plurality of interface units being provided in the control device to receive commands related to an input and an output of data stored in the memory device from an external device;
requesting a second processing unit of the control device to copy dump data of a second interface unit among the plurality of interface units, when detecting abnormality of the second interface unit while the first processing unit executes copying of dump data, the first and the second processing units distributing and executing processing in the control device.