Setting noout flag per Ceph OSD

Prior to Ceph Luminous you could only set the noout flag cluster-wide which means that none of your OSDs will be marked as out. On large(r) cluster this isn’t always what you want as you might be performing maintenance on a part of the cluster, but you sill want other OSDs which go down to […]

Safely backing up your Ceph monitors

So you might wonder: Why do I need to make a backup of my Ceph monitors? I have multiple monitors. That’s true, but would you run into the very unfortunate situation where you loose all you monitors, you loose all your data. The monitors contain very important metadata (pgmap, osdmap, crushmap) to run your cluster. […]