Patent ID: 7103739
Filing Date: 2006-09-05
Classification: G06F,Y10S

Abstract:
1. A method of reading data from a mirrored logical volume, comprising: receiving a read request directed to a mirrored logical volume; retrieving characteristic information for each of a plurality of physical devices associated with mirrors of the mirrored logical volume, wherein the characteristic information identifies a particular characteristic of a physical storage device itself and wherein the characteristic information distinguishes between different types of physical storage devices in the plurality of physical storage devices, and wherein the characteristic information includes at least one of whether a corresponding physical storage device includes a write cache, whether a corresponding physical storage device includes a read-ahead cache, a speed of a corresponding physical storage device, and a connection type of a corresponding physical storage device; applying one or more rules to the characteristic information to select a physical storage device from the plurality of physical storage devices to which the read request is to be directed; and reading the data from the selected physical storage device.