Re: OSD delete vs destroy vs purge

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> Thanks Eugen for the explanation. To summarize what I understood:
> - delete from GUI simply does a drain+destroy;
> - destroy will preserve the OSD id so that it will be used by the next OSD that will be created on that host;
> - purge will remove everything, and the next OSD that will be created will use a brand new id.

Unless something has changed in recent releases, there are some nuances:

Destroying an OSD leaves the OSD ID in the CRUSH map; it may be redeployed with the same ID when done so explicitly (ideally on the same device/slot).  That ID will not unless I’m mistaken be used by any new OSD deployment unless specified explicitly.

In the general case, OSD creation picks the lowest-numbered unused ID.

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