Commitlogs are filling the Full Disk space and nodes are down

[Mokkapati, Bhargav (Nokia - IN/Chennai)]

Hi Team,

My Cassandra version : Apache Cassandra 3.0.13

Cassandra nodes are down due to Commitlogs are getting filled up until full 
disk size.

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With "Nodetool flush" I didn't see any commitlogs deleted.

Can anyone tell me how to flush the commitlogs without losing data.

Thanks,
Bhargav M