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Architecture and Components 2-5
Hitachi Universal Storage Platform V/VM User and Reference Guide
Hardware Components
The USP V/VM hardware includes the controller, disk unit, and power supply
components. Each component is connected over the cache paths, shared
memory paths, and/or disk paths. The USP V/VM controller is fully redundant
and has no active single point of failure. All components can be repaired or
replaced without interrupting access to user data.
The main hardware components of the USP V and VM storage systems are:
• Shared Memory
• Cache Memory
• Host Channels and Front-End Directors
• Back-End Directors and Array Domains
• Hard Disk Drives
• Service Processor
• Power Supplies
• Batteries