Command multiplex number monitoring control scheme and...

Details Command multiplex number monitoring control scheme and... Command multiplex number monitoring control scheme and...

2006-06-27

2006-06-27

Huynh, Kim (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output access regulation

C710S005000, C709S217000

Reexamination Certificate

active

07069353

ABSTRACT:
There is provided a command multiplex number monitoring control scheme capable of avoiding issue of a QF status and getting rid of system performance degradation without adding command processing resources. Command issue multiplex numbers CMs (32, 16 and 8) for WWN1-LU2, WWN2-LU1and WWN3-LU0are set in a port PT1so as to be associated with the host bus adaptors HBAs in higher rank apparatuses HOST-1, HOST-2and HOST-3. Denoting the sum total of command issue multiplex numbers CMs for respective set access permissions by (C), an access permission satisfying the relationship represented as “command processing multiplex limit number (B)≧the sum total (C) of command issue multiplex numbers CMs for respective access permissions” is not permitted. Thus, the command issue multiplex numbers of the connected higher rank apparatuses are monitored.

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