Symmetra^® RM achieves N+1 redundancy through a new power sharing technology. Power sharing means that all of the modules in a Power Array™ run in parallel and share the load evenly. N+1 redundancy means running one extra module than necessary to support your full load. In this way, all of the modules support one another.

For example, if your computer load is 4kVA, you achieve N+1 with three 2kVA Power Modules. If a module fails or is removed, the other modules instantaneously begin supporting the full load. It does not matter which module fails because all of the modules are always running and supporting your load.

N+1 redundancy is used today in disk arrays, in processor power supplies, and in processors themselves. But, until now, N+1 redundancy has never been offered for server level power protection. As use of critical applications and databases increase, the Symmetra^® Power Array^™ brings glass house reliability to the mid-sized power protection range.