Method and means for execution of commands accessing variable le

Details Method and means for execution of commands accessing variable le Method and means for execution of commands accessing variable le

1991-04-02

1996-04-09

Harrell, Robert B.

Boots, shoes, and leggings

364DIG1, 364DIG2, 364952, 3649521, 3642481, G06F 1200

Patent

active

055069797

ABSTRACT:
Variable length records can be accessed from an array of N+2 synchronous fixed block formatted DASDs in a single pass and in the presence of a single DASD failure if each record is partitioned into a variable number of K fixed length blocks, the blocks are written on the DASDs in column major order K modulo (N+1), the order is constrained such that the first block of each record resides on the (N+l)st DASD, a parity block for each column resides on an (N+2)nd DASD, and each parity block spans N blocks in the same column from the first N DASDs and one block one column offset thereto on the (N+1)st DASD.

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