Ceph » RADOS

Joao Luis wrote:

The bits I found out were through skimming the code, and that did not provide too much insight on what the options really do.
Regardless, we can't expect our average user to do the same.

We should, at least, document how to use this with `osd pool set`, with a brief description of each option and possible values.

FWIW, Joao performed a quick scan of the code (mon/MonCommands.h and compressor/Compressor.cc), which revealed the following options for 'osd pool set': 'compression_mode, compression_algorithm, compression_required_ratio, compression_max_blob_size, and compression_min_blob_size

For 'mode', allowed values are "force", "aggressive", "passive", "none", for algorithm, "none", "snappy", "zlib", "zstd", and "lz4".

However, it would be helpful if these various options would be documented in more detail in the documentation.