System for equalizing operating temperature by allocating infrequently accessed data to the high temperature DASD and allocating frequently accessed data to the low temperature DASD

摘要

An array of direct access storage devices (DASD's) such as disk drive units includes a temperature sensor for sensing the operating temperature of each DASD. The operating temperatures of the DASD's of the array are equalized by allocating frequently accessed data to drives with relatively low operating temperature and allocating infrequently accessed data to drives with relatively high operating temperatures. Operating temperature information is used to identify a DASD that has a high probability of failure and the DASD can be shut down for replacement prior to actual failure by moving all data from that DASD to one or more other DASD's of the array.