[bluestore] How to deal with free fragmentation

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Hello,

I’m running Ceph 19.2.3 with cephadm on a 3-node cluster, and I
recently started seeing the following warning related to free
fragmentation:

HEALTH_WARN 3 OSD(s)
[WRN] BLUESTORE_FREE_FRAGMENTATION: 3 OSD(s)
     osd.0 0.802713
     osd.1 0.803276
     osd.2 0.803870

I haven’t been able to find clear guidance on how to address this issue.
Are there any recommended approaches or best practices for reducing
BlueStore free space fragmentation?

Thanks in advance for your help!

Florent.
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