I need to figure out some way of determining when it's OK to safely reboot a single node. I believe this involves making sure that at least one other monitor is running and up to date, and all the PGs on the local OSDs have up to date copies somewhere else in the cluster. We're not concerned about MDS at this time, since we're not currently using the POSIX filesystem.
I recall having a verbal conversation with Sage on this topic, but apparently I didn't take good notes or I can't find them. I do remember the solution was somewhat complicated. Is there any sort of straight forward 'ceph' command that can do this now? If there isn't one, I think it would be really great if something like that could be implemented. It would seem to be a common enough use case to have a simple command which could tell the admin if rebooting the node would render the cluster partially unusable. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
