The current BES RPM package installs with MDS unwritable
Either make the MDS an option or fix the MDS so that it's writable by the BES. This means the user/group bes/bes must be able to write to /usr/share/mds and /usr/share/mds_ledger.txt. We might move the latter inside the MDS dir.
Changing the owner/group of /usr/share/mds and all the files it contains plus moving the mds_ledger.txt into that dir seems to fix the problem.
Modify the RPM.
Test this on a clean C7 machine.