@Volkodav Welcome to the Rockstor community.
With regards to:
You could also build your own installer for our release candidate stage Rockstor 4 ‘Built on openSUSE’ variant:
Which is the future of Rockstor anyway. You will then have the required fix baked in as the installer currently uses Rockstor testing version 4.0.4 which is years newer than the now deprecated 3.9.1-16 CentOS based testing channel offering. And once installed it can be subscribed to either channel using a new or existing Stable subscription of you can leave it at it’s default of 4.0.4 and just installed upstream updates. The ‘Built on openSUSE’ variant testing channel is currently at 4.0.5:
Hope the helps and thanks for the feedback here.