Give exact commands and process to complete my requirements in linux
 

How to create 3 volume and it should have capability to increase and decrease size. Each volume shoud be of 5gb.
Create the logic to store the data in volume1 and volume2 and take a copy of vol1 and vol2 in vol3 for backup using datastrips across multiple drives with distributed parity.

Please resolve this as soon as possible

Welcome. Please re-read the forum rules and then carefully go over the guidelines on how to ask a useful question. Please resolve that as soon as possible.

Then you may wish to rephrase your question, including among other things, which distro you have (including version), what you have tried and which documentation or guides you have followed.

We are all volunteers here and won't do your homework for you. You need to do the work yourself but we can guide you past the difficult points.

This reads a lot like a homework question.

I agree, sound like homework to me too, sometimes, doing is learning... trial and error... if one is going to take a course in Linux, then one should make sure they have access to a PC/LT to practice with.

Please learn as soon as possible that this is not how Linux forums work. This attitude will draw reactions ranging from laughter to mockery and plain insults if someone is having a bad day and sees what you wrote. While LQ is one of the nicest online communities where the percentage of wannabe know-it-all bullies and karma harvesters feels like being below the average, please don't abuse this.