Large number of CommitLog-6-*.log files

After I set up an automatical backup, the folder /data/cassandra/commitlog is increasing every day.

Now it contains 211 CommitLog-files and takes 6.6 GB.

Can I delete a part of these files and how this problem can be fixed?

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Adding the following line to /etc/sysctl.conf :

vm.max_map_count = 1048575

resolves my issues


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