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The Inverted Pyramid of Doom

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SethT wrote:

Patently false. Statistically, SAN's that employ 2 or more controllers have significantly lower failure rates (by at least an order of magnitude). SAN's are designed with no single point of failure (SPOF). Dual power supplies, dual (or more) controllers, passive disk back-planes, etc.

Not to mention that they allow for better space utilization. Direct Attached Storage (DAS) is very wasteful of disk space that cannot be reclaimed because it is locked to a specific host.

I acknowledge that a SAN does not make sense in every case, but to claim that they have a failure rate comparable to a normal server is just plain wrong and misleading.

SAM's whole point, I think, is that anything that is not completely redundant is a single point of failure... What happens to a SAN that is a single box, when both controllers die. What happens...


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