Data protection for variable length records by utilizing high performance block storage metadata

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United States of America Patent

PATENT NO 9141477
APP PUB NO 20090259456A1
SERIAL NO

12100237

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An enhanced mechanism for providing data protection for variable length records utilizes high performance block storage metadata. In an embodiment, an emulated record that emulates a variable length record, such as a Count-Key-Data (CKD) record or an Extended-Count-Key-Data (ECKD) record, is generated by a Host Bus Adapter (HBA) of a mainframe system. The emulated record comprises a sequence of extended fixed-length blocks, each of which includes a data block and a footer. A confluence of the footers defines a high performance block storage metadata unit associated with the emulated record and includes a checksum that covers all data blocks and all footers of the entire emulated record. In one embodiment, the checksum is checked during transit of the emulated record between a HBA and a storage subsystem (e.g., by the HBA when the emulated record is received from the storage subsystem, and/or by a switch in the data transfer path), during a hardening step when writing the emulated record to a disk, and/or during a verification step when reading the emulated record from the disk.

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Patent Owner(s)

  • INTERNATIONAL BUSINESS MACHINES CORPORATION

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Amann, Stefan Boeblingen, DE 27 266
Banzhaf, Gerhard Nufringen, DE 34 478
Boyd, Kenneth Wayne Tucson, US 45 1055
Day,, III Kenneth Fairclough Tucson, US 25 358
Palm, Jeffrey William Rochester, US 9 226
Weber, Helmut H Dettenhausen, DE 13 320
Yudenfriend, Harry Morris Poughkeepsie, US 39 1557

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