Anton B. Rang wrote:
How badly can you mess up a JBOD?
Two words: vibration, cooling.
Three more: power, signal quality.
I've seen even individual drive cases with bad enough signal quality to cause
bit errors.
Yep, if I crank up the amp to over 1kW, then on some frequencies, I see lots
of noise on USB links as an example. You may have noticed that many vendors
are now making USB cables with torroids builtin. There is still some black art
involved in eliminating noise problems. However, one easy way to do it is well
proven in the PCB design space. We leverage that with Thumper which has no
internal disk cables. In fact, you should notice that many Sun designs have
few, if any, internal cables. Cables are a source of reliability issues, so
they
are best when they don't exist.
[waxing nostalgic]
When the designers were planning the Shinkansen (Japanese high speed train
system)
they had 150 years of train accident data to study. Not surprisingly, most
train
accidents occured at crossings. To help avoid accidents, they eliminated
crossings.
Good design is a good thing.
-- richard
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