> Just to make sure though, failure domains and device classes /can/ be > changed after the fact, right? Might become relevant whenever we add > SSDs into the mix.
Yes, those two factors are basically only telling a pool on which OSDs to move to, and can be set and reset as you want. We have given some OSDs special device-class names (like ssd-rack-1) so we later can point a pool to only choose those OSDs to place itself on when migrating from older ssds to newer ones. In this case, the type of replication/EC doesn't matter since it is not changing. Also, if you screw this up (like asking a 7+3 pool to move to a list of only 8 OSDs so it doesn't "fit") it will just make the PGs "misplaced" and refuse to move, while still serving data, so you can undo this choice. -- May the most significant bit of your life be positive. _______________________________________________ ceph-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
