Hi,

There is no need to rebuild all ODS. You can follow the procedure
described by RedHat[0] to convert the DB and tell the OSD to use
rocksdb.
Couldn't find this documented elsewhere. You may need a RedHat account
to access the content, but you could create a developer one for free
IIRC.

[0] https://access.redhat.com/solutions/3210951

---
Alex Cucu


On Wed, Jan 22, 2020 at 5:30 PM Robert LeBlanc <rob...@leblancnet.us> wrote:
>
> In the last release of Jewel [0] it mentions that omap data can be stored in 
> rocksdb instead of leveldb. We are seeing high latencies from compaction of 
> leveldb on our Jewel cluster (can't upgrade at this time). I installed the 
> latest version, but apparently that is not enough to do the conversion. Is 
> there a way to move OSDs from leveldb to rocksdb without trashing and 
> rebuilding all the osds?
>
> [0] https://docs.ceph.com/docs/master/releases/jewel/
>
> Thanks,
> Robert LeBlanc
> ----------------
> Robert LeBlanc
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