Check that a network change hasn’t caused problems with jumbo frames if in use. If jumbo frames are not working correctly, smaller packets will most likely be successfully getting through to other OSDs and MONs, but larger packets will be dropped. This will result in OSDs that appear to be half functioning, and it can be very difficult to find an obvious cause. If something odd seems to be happening, always check that jumbo frames are being allowed across your network using ping.