Until we get a proper Gluster package in XCP-ng. Adding a SR can be tricky, due to a lot of static values everywhere regarding SR names.

I'm not 100% it's enough to put a warning and have this in the official wiki. There is a lot of changes that could clashes with current code (eg with XAPI conf: with ext4 and xfs, we use an extra file outside it).

So this guide could potentially cause issue. Maybe using your own Gist until it's pushed in XCP-ng would be better?