Do we need to procure extra license if we upgrade version 6.3 to 7.... We will be setting up new structure for 7 and if it works fine with no issues then we will remove the 6.3 version. It means both will be running for one month on overlap. We are not installing new version on top of old one. For this scenario do we need an extra license procurement?
When you upgrade your license, you have the option of getting a temp license key (which if I remember correctly is valid for 4 weeks) to make sure the upgrade goes smoothly. Sounds like this should take care of your use case.
That would depend on how the existing storage is set up. Is the directory under the 6.3 folder or is it an independent directory with a symlink? Additionally, it doesn't look like you are actually upgrading the servers (but spinning up a new deployment) so that would make things much harder for you.