Set an arbitrary device class for those OSDs, say “ssdreserved”, and define a 
CRUSH rule for that pool that matches only that class.  Use rules for other 
pools that constrain to “ssd”, “hdd”, etc.  

Device class names can be set to whatever you want, it’s easy to think trust 
they’re pinned to hardware type, but that’s not true.  

> On Aug 21, 2022, at 11:00 AM, Boris <b...@kervyn.de> wrote:
> 
> Cheers,
> because of this bug (https://tracker.ceph.com/issues/53585) I‘d like to 
> reserve one SSD OSD per host exclusive for a single pool. All other pools can 
> take whatever OSDs they want. 
> 
> Is this possible?
> 
> Best wishes
> Boris
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