Comment 1 for bug 1895189

I just got hit by this. I was trying to figure out why 1G hugepages weren't working on a customer's hugepage-enabled compute nodes, despite having everything configured in the sysconfig charm. Upon digging deeper, I found that the config option was set after the subordinate was deployed, and since the update-grub config option was false (per recommended default), the grub configs were not rewritten. As the node has been rebooted since the change was made, there was no indication in Juju status that it was necessary to run "update-grub" to finalize the changes.