monitor

Ceph Monitors are laggy or clock might be skewed

Ceph Monitors are laggy or clock might be skewed 1500 1000 Wido den Hollander

This weekend I got to investigate a Ceph cluster which had issues where the Monitors were constantly performing new elections. After some investigation on of the three monitors was eating 100% CPU on a single core and kept printing this in the logs: mon.charlie@2(peon).paxos(paxos updating c 106399655..106400232) lease_expire from mon.0 [2a00:XXX:121:XXX::6789:1]:6789/0 is 2.380296 seconds in…

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Protecting your Ceph pools against removal or property changes

Protecting your Ceph pools against removal or property changes 1506 1001 Wido den Hollander

One of the dangers of Ceph was that by accident you could remove a multi TerraByte pool and loose all the data. Although the CLI tools asked you for conformation, librados and all it’s bindings did not. Imagine explaining that you just removed a 200TB pool from your storage system due to a typo in…

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