Storage Technology Corporation

Jim Lloyd Mechalke, Jr

Michael Richard Crater

Steven Christopher Fraioli

A method and system are provided for improving efficiency of storing and accessing data blocks for systems that are limited to small size, host accessible data blocks, such as having a maximum size of 512 bytes, by allowing larger size subsystem data blocks to be created from the smaller size logical data blocks. A host command is analyzed to determine whether the host accessible logical data block aligns with the larger subsystem block. If so, the larger block(s) is(are) sent to the host. If the command does not align, the larger block is processed into a plurality of segments so that the addressed data block(s) can be aligned, and any error correction coding verified. The present invention allows a subsystem to store and manage efficiently sized blocks of data while still supporting a host's need to access smaller, single architecturally defined addressable blocks. The present invention is particularly suited for use with storage architectures arranged to compress data and add CRC redundancy codes, such as a shared virtual array (SVA) architecture.

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Longmont, CO, United States of America

Jim Lloyd Mechalke, Jr