Andy Ammo
Dear Andy,
Oh, man, you again??? OK, here's what I dug up.
The MDS 9000 has two clock modules a primary one and a backup one that regulate the status of the switch's backplane. According to the MDS 9000 configuration guide, if the first clock module fails the switch shuts down and restarts, at which point the second one takes over. The issue is, that would obviously cause the switch to become temporarily unavailable.
Cisco's response: Yes, it's true the switch would be temporarily unavailable if clock module A died on you. But the company says each clock module has a MTBF (mean time between failures) of 3 million hours -- or about 351 years. "Taking a step back, 351 years ago, Louis XIV (Louis the Great) was the king of France," says Cisco's John Noh. "A lot can happen in 351 years, the least of which being a clock module failing." Actually, according to my math, 3 million hours = 342.5 years... but who's counting?
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