Increase disk space by adding volume only, it is okay?

[TGates]

this solution would work for both old sites (in old space) with new sites (new volume)?

basically, I would do:

1. add new volume
2. use Sentora cpanel to create new sites like the past
3. edit vhost configs of new sites to point the "DocumentRoot" to new volume for each site

My work is okay?

You can not edit the http-vhosts.conf it will be over-written by Sentora whenever changes are made.
You will have to move the old sites into the new vhost folder.