For even greater addressing capability, GS1280, ES80, ES47 PSU 1200W PFC Correct, 2P -11M-PLUS supports supervisor mode libraries. The GS1280, ES80, ES47 PSU 1200W PFC Correct, 2P 11M PLUS system can automatically create and maintain records. - - These records are kept in an accounting log file. Accounting information is pro- vided on users, the system, and every task running in the system. The system manager can use these accounting logs to establish programs for reporting on the use of system resources and for billing. Accounting also provides extensive performance information on mass-storage devices. GS1280, ES80, ES47 PSU 1200W PFC Correct, 2P 11M PLUS supports overlapped seeks, request queue optimization, disk - - data caching and dynamic dual GS1280, ES80, ES47 PSU 1200W PFC Correct, 2P pathing. RSX 11M PLUS also provides "shad- - - owed disk" support, or redundant recording of data on a secondary disk to nearly eliminate the possibility of lost data or unscheduled downtime as a result of hard-disk errors.