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CEPH inline compression
https://docs.ceph.com/en/latest/rados/configuration/bluestore-config-ref/#inline-compression
BlueStore compression performance
ceph osd pool set rbd compression_algorithm snappy ceph osd pool set rbd compression_mode aggressive
Check compression ratios:
ceph daemon osd.2 perf dump | egrep -i "bluestore_compressed|bluestore_allocated|bluestore_stored|compress_.*_count"
or
ceph daemon osd.0 perf dump | egrep -i "bluestore_compressed|bluestore_allocated|bluestore_stored|compress_.*_count|bluestore_write_big|bluestore_write_small"