DISK STORAGE UPGRADE IN TRIUMF'S CENTRAL CONTROL SYSTEM

The TRIUMF 500 MeV cyclotron's central control system (CCS) was upgraded a few years ago. Since then, evolving requirements have prompted changes to various sub-systems of the control system. Recently, the disk storage has been upgraded. The disk sub-systems are a major component in the control system and in part determine allowable configurations and software/ hardware maintenance issues. The old and new configurations are described along with the new requirements and considerations. Functionality, performance, expandability, and other characteristics of the new system are also covered. In particular, the multi-porting of the disks is reviewed.