Quoting Nick Fisk (nick@xxxxxxxxxx): > Hi All, > > Has anyone been testing the bluestore pool compression option? > > I have set compression=snappy on a RBD pool. When I add a new bluestore OSD, > data is not being compressed when backfilling, confirmed by looking at the > perf dump results. If I then set again the compression type on the pool to > snappy, then immediately data starts getting compressed. It seems like when > a new OSD joins the cluster, it doesn't pick up the existing compression > setting on the pool. > > Anyone seeing anything similar? I will raise a bug if anyone can confirm. Yes. I tried to reproduce your issue and I'm seeing the same thing. The things I did to reproduce: - check for compressed objects beforehand on osd (no compressed objects where there) - remove one of the osds in the cluster - ceph osd pool set CEPH-TEST-ONE compression_algorithm snappy - ceph osd pool set CEPH-TEST-ONE compression_mode force - rbd clone a rbd image - let cluster heal again - check for compressed bluestore objects on "new" osd (ceph daemon osd.0 perf dump | grep blue): "bluestore_compressed": 0, "bluestore_compressed_allocated": 0, "bluestore_compressed_original": 0 - check for compressed bluestore objects on already existing osd (ceph daemon osd.1 perf dump | grep blue): "bluestore_compressed": 2991873, "bluestore_compressed_allocated": 3637248, "bluestore_compressed_original": 10895360, Gr. Stefan -- | BIT BV http://www.bit.nl/ Kamer van Koophandel 09090351 | GPG: 0xD14839C6 +31 318 648 688 / info@xxxxxx _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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