Expedited dynamic mirror service policy

Details Expedited dynamic mirror service policy Expedited dynamic mirror service policy

2005-10-11

2005-10-11

Portka, Gary (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C710S018000, C711S111000

Reexamination Certificate

active

06954833

ABSTRACT:
A seek minimizing process for use in storage controller of a data storage system is presented. The process collects statistics for physical devices storing mirrored logical volumes. The statistics include utilization and activity level. The process determines from the statistics the top n busiest physical devices. The process evaluates each of the n physical devices for mirror policy adjustment that will result in reduced seek time when the utilization of the physical device is greater than a threshold, for example, 50%.

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S. Chen and D. Towsley, “Performance of a Mirrored Disk in a Real -Time Transaction System,” University of Massachusetts, Amherst, MA 01003, © 1991 ACM.
L. Golubchik, J. C. S. Lui and R. R. Muntz, “Chained Declustering: Load Balancing and Robustness to Skew and Failures,” University of California, Los Angeles, CA 90024, © 1992 IEEE.

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