# US 2014/0157047 A1 · Recovery control in mirrored disks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0157047 A1 - Document ID: US20140157047A1 - Status: Published application - Kind: A1 - Application number: 14/174,712 - Filed: 2014-02-06 - Published: 2014-06-05 - Earliest claimed: 2011-04-22 - Assignees: International Business Machines Corporation - Applicants: International Business Machines Corporation - Inventors: Eric J. BARTLETT; Colin R. JEWELL; John E. LINDLEY; William J. SCALES - Web page: https://patentgrep.com/patent/US20140157047A1 ## CPC - G06F 11/2082: {Data synchronisation} - G06F 3/0604: {Improving or facilitating administration, e.g. storage management} - G06F 3/065: {Replication mechanisms} - G06F 3/0689: {Disk arrays, e.g. RAID, JBOD} - G06F 11/2087: {with a common controller} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A method for operating a mirrored disk storage system, comprises a determiner component for determining a repair characteristic of a pair of mirrored disks, a comparator for comparing said repair characteristic of a first of said pair with said repair characteristic of a second of said pair, and a cancelling component for cancelling a repair action for said one of said first or said second of said pair that is not selected by said selector. ## Claims ### Claim 1 A method of operating a mirrored disk storage system, comprising the steps of: determining a repair characteristic of at least a pair of mirrored disks; comparing said repair characteristic of a first of said pair with said repair characteristic of a second of said pair; and cancelling a repair action for said one of said first or said second of said pair that is not selected by said selector. ### Claim 2 (depends on 1) The method of claim 1, further including selecting one of said first or said second of said pair having a preferred repair characteristic to be used as a synchronization source disk, wherein said preferred repair characteristic comprises a characteristic that no repair is required for said one of said first or said second of said pair. ### Claim 3 (depends on 2) The method of claim 2, wherein said preferred repair characteristic comprises a characteristic that a least repair time is required for said one of said first or said second of said pair. ### Claim 4 (depends on 3) The method of claim 3, wherein said preferred repair characteristic comprises a characteristic that no repair is required for said one of said first or said second of said pair and that said one of said first or said second of said pair is a space-efficient copy. ### Claim 5 (depends on 1) The method of claim 1, further including detecting that a failure has left read stability in doubt. ### Claim 6 (depends on 1) The method of claim 1, further comprising a step of synchronizing said first and said second of said pair using said one of said first or said second of said pair having a preferred repair characteristic as said synchronization source disk. ### Claim 7 An apparatus for operating a mirrored disk storage system, comprising: a determiner component for determining a repair characteristic of a pair of mirrored disks; a comparator for comparing said repair characteristic of a first of said pair with said repair characteristic of a second of said pair; and a cancelling component for cancelling a repair action for said one of said first or said second of said pair that is not selected by said selector. ### Claim 8 (depends on 7) An apparatus as claimed in claim 7, further including a detector component operable to detect that a failure has left read stability in doubt and a selector for selecting one of said first or said second of said pair having a preferred repair characteristic to be used as a synchronization source disk, wherein said preferred repair characteristic comprises the characteristic that no repair is required for said one of said first or said second of said pair. ### Claim 9 (depends on 8) An apparatus as claimed in claim 8, wherein said preferred repair characteristic comprises a characteristic that a least repair time is required for said one of said first or said second of said pair. ### Claim 10 (depends on 9) An apparatus as claimed in claim 9, wherein said preferred repair characteristic comprises a characteristic that no repair is required for said one of said first or said second of said pair and that said one of said first or said second of said pair is a space-efficient copy. ### Claim 11 (depends on 7) An apparatus as claimed in claim 7, further comprising a synchronizing component for synchronizing said first and said second of said pair using said one of said first or said second of said pair having a preferred repair characteristic as said synchronization source disk. ### Claim 12 A physical computer non-transitory storage medium comprising a computer program product method for operating a mirrored disk storage system, the physical computer non-transitory storage medium comprising: computer code for determining a repair characteristic of at least a pair of mirrored disks; computer code for comparing said repair characteristic of a first of said pair with said repair characteristic of a second of said pair; and computer code for cancelling a repair action for said one of said first or said second of said pair that is not selected by said selector. ### Claim 13 (depends on 12) The physical computer non-transitory storage medium of claim 12, further including computer code for detecting that a failure has left read stability in doubt and computer code for selecting one of said first or said second of said pair having a preferred repair characteristic to be used as a synchronization source disk, wherein said preferred repair characteristic comprises a characteristic that no repair is required for said one of said first or said second of said pair. ### Claim 14 (depends on 13) The physical computer non-transitory storage medium of claim 13, wherein said preferred repair characteristic comprises a characteristic that a least repair time is required for said one of said first or said second of said pair. ### Claim 15 (depends on 14) The physical computer non-transitory storage medium of claim 14, wherein said preferred repair characteristic comprises a characteristic that no repair is required for said one of said first or said second of said pair and that said one of said first or said second of said pair is a space-efficient copy. ### Claim 16 (depends on 12) The physical computer non-transitory storage medium of claim 12, further comprising computer code for synchronizing said first and said second of said pair using said one of said first or said second of said pair having a preferred repair characteristic as said synchronization source disk.