What Are Disadvantages Of Multiprocessing?

If we divide functions among several processors, then

if one processor fails then it will not affect the system or we can

say it will not halt the system, but it will affect on the work speed.

Suppose I have five processors and one of them fails due to some

reasons then each of the remaining four processors will share the work

of failed processor. So it means that system will not fail but

definitely failed processor will affect on its speed.