Data sharing between system using different data storage formats

Details Data sharing between system using different data storage formats Data sharing between system using different data storage formats

1998-02-10

2000-03-21

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Addressing combined with specific memory configuration or...

Dynamic-type storage device

711112, 711202, 395500, G06F 1200

Patent

active

060413867

ABSTRACT:
Disclosed is a system, typically implemented in a storage controller, for extracting data from a device storing data in a first format, such as the count-key-data (CKD) format. The first format is comprised of a plurality of tracks. Each track has at least one data area and each data area is comprised of at least one addressable block of data. A request from a host system for an address of a block of data in a second data format, such as the Fixed Block Architecture (FBA) format, is received. The system calculates a byte displacement value for the requested address. A data area in a track in the device having a byte displacement value less than the byte displacement value for the requested address is located. A byte location offset is then determined by subtracting the byte displacement value for the located data area from the byte displacement value for the requested address. The system then determines a location in the located data area of a block of data at the byte location offset. The system then provides the host system with the located block of data.

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