The constraint files has: <hardware> <disk> <size unit="G">36</size> </disk> With a few overrides: aarch64: <size unit="G">12</size> armv6l/armv7l: <size unit="G">12</size> ppc64/ppc64le: <size unit="G">25</size> Those are the constraints to find a worker that matches the requirement. Of course, the lower the limits, the more workers can be found to satisfy the build