Had the strangest PERC 800 failure today, luckily not serious and not on a busy server.
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Every physical disk (6 in all) in a VD went to failure thus killing the whole VD. What's odd is that on reseating them and importing the now foreign config it went back to normal.
I have seen this only once before, and that was with a single disk that died then came back to life when taken out and put back in.