You can’t just purchase new drives & replace them one by one & see the new space. Now what you can do is to replace the drive one at a time & then do a reconfigure. To do a reconfigure you will need to be using open manage 7.1 or higher you can click on the virtual disk and do a reconfigure. When you go into the reconfigure you should see the option to expand using the available space. Now it is best to get a backup before attempting this just incase you run into any issues with it.
Please let us know if you have any other questions.
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