The CPU modules run in lockstep when both are present. Indicator lights on the front will let you know if hardware fails in either module, and the remaining working module will continue to run. For the disk subsystem, each blade contains a set of disks. Veritas Volume Manager for Windows software is used to keep the two blades in sync. In our tests, we were able to remove both a disk blade and a processor blade, and the system acted as if nothing happened.
If you're trying to achieve that elusive 99.999 percent uptime for a system and worried that a hardware failure will throw a wrench in your plan, the NEC Express5800/ft is worth a look.
NEC Express5800/ft, $29,893 as tested. NEC Corp., (800) 338-9549. www.nec.com
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