Re: Reserve OSDs exclusive for pool

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https://ceph.io/en/news/blog/2017/new-luminous-crush-device-classes/

It’s in the CRUSH map, so it’s persistent.  

> On Aug 21, 2022, at 12:12 PM, Boris Behrens <bb@xxxxxxxxx> wrote:
> 
> Hi Anthony,
> oh that is cool.
> 
> Does the OSD overwrite it, after restarts? Anything I would need to know,
> after doing this to persist it?
> 
> Cheers
> Boris
> 
>> Am So., 21. Aug. 2022 um 20:55 Uhr schrieb Anthony D'Atri <
>> anthony.datri@xxxxxxxxx>:
>> 
>> 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.
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