If you just have 1 disk per node/testing/POC then you can reduce the overall disk usage during install as below:

1.) Click on "Options" on the HDD that you want to install to.

2.) Under "hdsize" Set the Maximum Size smaller than the disk size.

In this example the disk is 60G and I set max size as 20G.  This then leaves 40G remaining of unpartitioned space that you could later use for other things like Ceph, DRBD etc...

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