The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 2008
Filed:
Nov. 29, 2004
Ron Arnan, Brookline, MA (US);
Tao Kai Lam, Somerville, MA (US);
Hui Wang, Upton, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
An optimizer process in a storage system automatically selects access activity data for storage devices in the system during periods of interest so that a volume-swapping optimization analysis is based on desired device performance information and thus yields improved optimization results. For each of a number of sampling intervals in an analysis period, workload statistics are collected for logical volumes in the system. From the workload statistics, a service time is calculated for each storage device for each sampling interval. A set of highest service times is identified from the service times for each device, such as those above the 80th percentile, and a service time measure is generated from the set of highest service times. Devices having the highest and lowest measures are identified, and a pair of volumes is identified that, if swapped between the two devices, would improve the service time measure of the higher-service-time device without unduly degrading the service time measure of the lower-service-time device. Such volumes are subsequently swapped, improving the performance of the higher-service-time device and the overall system.