Temporary RAID System Sparing to Low Cost Devices
Original Publication Date: 2004-Nov-11
Included in the Prior Art Database: 2004-Nov-12
Direct access storage device (DASD) storage systems that manage multiple RAID arrays typically limit their underlying storage devices to a particular protocol class/type. DASD RAID controllers that use global sparing need methods/rules to determine what storage devices are spare candidates for particular RAID arrays. Allowing storage device intermix that goes beyond different size and speed (i.e.; FC-AL, SATA, SAS) within the same global sparing domain can create reliability and performance issues with RAID array sparing scenarios. Maintaining all enterprise class devices for a particular system requires that a customer bear the cost of enterprise storage devices for all devices including spare devices that are not being actively used.