> On Dec 8, 2025, at 4:07 AM, Olivier Delcourt via ceph-users 
> <[email protected]> wrote:
> 
> 
> 
>> Le 8 déc. 2025 à 09:36, Robert Sander via ceph-users <[email protected]> a 
>> écrit :
>> 
>> Hi,
>> 
>> Am 08.12.25 um 9:32 AM schrieb Nico Schottelius via ceph-users:
>> 
>>> since migrating to Squid (19.2.3), I get the following health warning:
>>> [WRN] BLUESTORE_FREE_FRAGMENTATION: 1 OSD(s)
>>>     osd.25 0.806301

How large is this OSD?

>>> However while this is a warning, there seems to be no documented way of
>>> fixing it.
>>> What do I do with this warning / how to defrag the bluestore filesystem?
>> 
>> Even the IBM documentation recommends to contact the IBM support in this 
>> case: 
>> https://www.ibm.com/docs/en/storage-ceph/8.1.0?topic=bluestore-fragmentation-tool
>> 
>> My best bet is to just recreate the OSD.
> 
> Before that, what about trying to empty the OSD ( ceph osd reweight XXX 0) 
> and when empty, put it back to business ( ceph osd reweight XXX 1) ?

I suspect that would do the trick, but would suggest instead "crush reweigh" so 
that the balancer doesn't get confused.
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