Grumpy's law of device redundancy

[andygates]

In any multi-device redundant array:  Number of devices that can fail simultaneously while still running: N.  Number of devices that happen to fail spontaneously: N + 1.

Comments

[(Anonymous)]

Increasing redundancy is inversely proportional to maintenance repair rate.

ie: the failures that occur simple indicate the failsafe system is working. Thus we should rejoice in our increasing safety!

[andygates.livejournal.com]

Aye, of course it is - we change disks pretty regularly. That's by design! But last week was a sick parade of Murphy badness.