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Learning Ceph - Second Edition by Karan Singh, Vaibhav Bhembre, Anthony D'Atri

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Debug levels

The constellation of messages that Ceph OSDs can log is huge and changes with each release. Full interpretation of logs could easily itself fill a book, but we'll end this section with a brief note regarding the logging levels summary within the above excerpt.

--- logging levels ---0/ 5 none0/ 0 lockdep0/ 0 context

Ceph's allows us to finely control the verbosity with which it logs events, status, and errors. Levels may be independently set for each subsystem to control verbosity. Moreover, each subsystem has separate verbosity levels for information kept in process memory and for messages sent to log files or the syslog service. Higher numbers increase verbosity. The output and memory levels can be set independently, or separately. ...

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