Methods and systems for managing I/O requests to minimize...

Details Methods and systems for managing I/O requests to minimize... Methods and systems for managing I/O requests to minimize...

2006-09-29

2010-10-05

Patel, Hetul (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S114000, C711S161000, C711S162000, C707S640000

Reexamination Certificate

active

07809912

ABSTRACT:
Methods and systems are provided for minimizing disruptions when host data on a source logical unit is migrated onto a target logical unit. I/O requests are managed in a particular order during various states of the migration. After the target logical unit is synchronized with the source logical unit and before a commitment to the target logical unit is made, the target logical unit can be evaluated. At that point, the migration can be aborted. During the evaluation of the target logical unit, I/O requests that were directed to the source logical unit are redirected to the target logical unit and I/O requests that were directed to the target logical unit are redirected to the source logical unit. The disclosed methods and systems are equally effective at enabling less disruptive virtualization of a source logical unit as a target logical unit.

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