some cognition on volume testing,stress testing and performance testing

   As you know,I've talked about stress testing.Recently,I read volume testing and performacne testing.I found that among these three concepts have some small differences.The important thing is destinguishing them is better for us to design test cases.So let's start.
   At first,volume testing is similar with stress testing which I've refered in an article.Actually,I didn't understand at that time at all.Now I have a deep cognition on it.It is a program that is supposed to handle files spanning multiple volumes,enough data are created to cause the program to switch from one volume to another.In other words,the purpose of volume testing is to show that the program cannot handle the volume of data specified in its objectives.I think we must prepare lots of test data before implement this test.Therefore volume testing being obviouly expensive,both machine and people time,one must not go overboard.However,every program must be exposed to at least a few volume tests.
   So what is the difference between them?I claim that for stress testing the important thing is loading  vast data simultaneously or over a short span of time.Take for example,for a system which must have lots of different functions,we can test its different functions at same time.However,this is an aspect of stress testing.An additional stress test may occur when we know the limit of a program.Except testing the limit of it, we also need to test what will happen when some unexpected data entered,maybe that overrun the boundary.On the other hand,volume testing is test from one volume to another.
   At last I want to talk about the difference between stress testing and performance testing.Performance testing is test some specific performance  or efficiency objectives,stating such properties as response times and throughput rates under certain workload and configuration conditions.That will apparent,certain workload is the basis of this test.The purpose of it is to test those specific performance or objectives.Therefore,test case is devised that attempt to verify whether the program eligible for its objectives.Additional,I think we can take advantage of these two kind testing together.For example,we can test some extra performances under plenty data after we test them separately.I think that is a good guarantee for system to make sure its quality.
   Above these are some cognition on volume testing,stress testing and performance testing.I use for some reference from the book named The Art of Software Testing,and add some own view.I also have some question about volume testing.Actually,I'm not very clear for the meaning of volume.It means different test environment or different kind of data.I'm confused on it.So if you know it,please leave your advise.I'm really appreciate you.Thank you so much!