As Ceph relies on the network it runs over to be reliable, it can be beneficial to monitor network devices for errors and performance issues. Most network devices can be polled via SNMP to obtain this data. In addition, if using jumbo frames, you may what to consider if it is possible to create some automated ping monitoring to continuously check that jumbo frames are working correctly on your network. You never know when an unexpected change may affect the ability of your network to pass jumbo frames, causing confusion as your Ceph cluster suddenly starts going haywire.