[ceph-users] bluestore compression questions

We're considering using bluestore compression for some of our data, and I'm not entirely sure how to interpret compression results.  As an example, one of the osd perf dump results shows:         "bluestore_compressed": 28089935,         "bluestore_compressed_allocated": 115539968,         "bluestore_compressed_original": 231079936, Am I right to interpret this as "Originally 231079936 bytes (231GB) were compressed to 28089935 bytes (28GB) and were stored in 115539968 bytes (115GB)".  If so, why is there such a huge discrepancy between the compressed_allocated and compressed numbers (115GB vs 28GB)? Also, ceph df detail also shows some compression stats:     POOL                      ID     STORED      OBJECTS USED        %USED     MAX AVAIL     QUOTA OBJECTS     QUOTA BYTES     DIRTY       USED COMPR     UNDER COMPR     cephfs_data_ec63_c         5     1.2 TiB 311.93k     1.7 TiB      0.02       5.4 PiB     N/A N/A             311.93k        116 GiB         232 GiB Would this indicate that the compressed data takes up exactly half the space (which coincides with what the osd's are saying)?  It is odd that the allocated numbers are always half the original numbers ... This is ceph Nautilus with all the defaults for compression (except turning it on for the pool in question).  Any insights here would be appreciated. Thanks, Andras