Ceph bluestore lz4 compression

[alexskysilk]

Bluestore is pretty awesome and supports inline compression, which would be great for reducing size and increasing performance. Unfortunately, the lz4 compression module is not included in the official release.

devs- can you remedy this please

 

[fabian]

since it seems like it's only disabled by default upstream because Ubuntu Trusty's lz4 version is too old, I think we can enable this on our next build (it is opt-in anyway).

 

[xcdr]

Any news about enabling compression?

 

[fabian]

forgot to ping this thread - the current 12.2.2 packages are built with LZ4 support.

 

[xcdr]

Fine, how I can safely enable compression on existing production pool?

Is safe directly that way?

ceph osd pool set rbd compression_algorithm lz4
ceph osd pool set rbd compression_mode passive

 

[Waschbüsch]

Fine, how I can safely enable compression on existing production pool?

xcdr, do you know if qemu-kvm provide the COMPRESSIBLE / INCOMPRESSIBLE hint to the ceph backend?
E.g. will the compression_mode passive result in any compression or do I have to use aggressive mode for that?

 

[xcdr]

I don't know, I using aggressive.