[cisco-voip] Unity not failing over to CM sub ?

[Dark Fiber]

CallManager 4.1(3) Publisher and Subscriber and Unity 4.0(4)

Today CM publisher went down, still trying to figure out why but it
seems to be related to a failed drive.  Drive is part of a mirror
though so I am a little confused why it would take CM down.  Need to
research that more and see if I can figure out a root cause.

Anyway, the issue I find more puzzling is why Unity quit working when
the Pub went down.  Sub was up and phones worked, although we did
loose the directory but Unity stopped also.

Any tips on what I should look for or at?  Unity shouldn't fail like
that when you loose one of your CM's right?

I seem to recall having this happen at the last place I was at.  I
can't recall the fix though.

I am being vague I know and it would be hard to provide a direct
answer, looking more for just some starting points as to where and
what to look for.

Thanks!