Method for enhancing performance of a RAID 1 read operation usin

Details Method for enhancing performance of a RAID 1 read operation usin Method for enhancing performance of a RAID 1 read operation usin

1996-03-15

1998-05-26

Shin, Christopher B.

395826, 395827, 395841, 395852, 395879, 395441, G06F 1314

Patent

active

057581878

ABSTRACT:
An I/O command block, that is stored in a memory, includes information for connecting the I/O command block to other I/O command blocks in a chain structure. The I/O command block chain structure allows simultaneity of execution, provides a mechanism to inhibit and enable execution of an individual I/O command block, and a mechanism for establishing precedence in the sequence of execution of the I/O command blocks. This level of capability is provided by only information in the I/O command blocks within the chain. To enhance a RAID 1 read operation, a pair of killer I/O command blocks for the RAID 1 read operation are built in a chain. Each of the killer I/O command blocks includes a read command for a target device. The pair of killer I/O command blocks are enabled concurrently for execution. During execution, one of the pair of killer I/O commands marked for abortion by the other of the pair of killer I/O commands upon the other of the pair of killer I/O commands initiating data transfer.

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