Can I ask C++ question which are related to KVM & LVM server on server fault or I need to ask them only on "stack overflow" or "programmers" ? I am asking this because I need much of hardware info than C++ but the query is truly C++ based.
Also I need to know Can I ask same question one more than one site of stack exchange? please suggest.
Can I ask same question one more than one site of stack exchange?
You should not. You should look at the FAQ serverfault.com/faq or stackoverflow.com/faq. If your question does not clearly belong on the site, then don't ask it ask it on that site.. If you do think it belongs then ask it on the site you think fits best. If we disagree we will move it.
If a programming language tag is appropriate to the question it is very unlikely that the question is appropriate for Server Fault. Tags such as c++, c#, etc. shouldn't even exist on SF because they belong only on programming questions.