Hi! After upgrading MONs and MGRs successfully, the first OSD host I upgraded on Ubuntu Bionic from 14.2.16 to 15.2.10 shredded all OSDs on it by corrupting RocksDB, and they now refuse to boot. RocksDB complains "Corruption: unknown WriteBatch tag". The initial crash/corruption occured when the automatic fsck was ran, and when it committed the changes for a lot of "zombie spanning blobs". Tracker issue with logs: https://tracker.ceph.com/issues/50017 Anyone else encountered this error? I've "suspended" the upgrade for now :) -- Jonas