I'm using compression on a cephfs-data pool in luminous. I didn't do
anything special
$ sudo ceph osd pool get cephfs-data all | grep ^compression
compression_mode: aggressive
compression_algorithm: zlib
You can check how much compression you're getting on the osd's
$ for osd in `seq 0 11`; do echo osd.$osd; sudo ceph daemon osd.$osd
perf dump | grep 'bluestore_compressed'; done
osd.0
"bluestore_compressed": 686487948225,
"bluestore_compressed_allocated": 788659830784,
"bluestore_compressed_original": 1660064620544,
<snip>
osd.11
"bluestore_compressed": 700999601387,
"bluestore_compressed_allocated": 808854355968,
"bluestore_compressed_original": 1752045551616,
I can't say for mimic, but definitely for luminous v12.2.5 compression
is working well with mostly default options.
-Rich
> For RGW, compression works very well. We use rgw to store crash dumps, in
> most cases, the compression ratio is about 2.0 ~ 4.0.
> I tried to enable compression for cephfs data pool:
> # ceph osd pool get cephfs_data all | grep ^compression
> compression_mode: force
> compression_algorithm: lz4
> compression_required_ratio: 0.95
> compression_max_blob_size: 4194304
> compression_min_blob_size: 4096
> (we built ceph packages and enabled lz4.)
> It doesn't seem to work. I copied a 8.7GB folder to cephfs, ceph df says it
> used 8.7GB:
> root at ceph-admin:~# ceph df
> GLOBAL:
> SIZE AVAIL RAW USED %RAW USED
> 16 TiB 16 TiB 111 GiB 0.69
> POOLS:
> NAME ID USED %USED MAX AVAIL OBJECTS
> cephfs_data 1 8.7 GiB 0.17 5.0 TiB 360545
> cephfs_metadata 2 221 MiB 0 5.0 TiB 77707
> I know this folder can be compressed to ~4.0GB under zfs lz4 compression.
> Am I missing anything? how to make cephfs compression work? is there any
trick?
> By the way, I am evaluating ceph mimic v13.2.0.
> Thanks in advance,
> --Youzhong
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