[PVE-User] Create secondary pool on ceph servers..

Alwin Antreich a.antreich at proxmox.com
Tue Apr 14 20:30:33 CEST 2020

On Tue, Apr 14, 2020 at 02:35:55PM -0300, Gilberto Nunes wrote:
> Hi there
> I have 7 servers with PVE 6 all updated...
> All servers has named pve1,pve2 and so on...
> On pve3, pve4 and pve5 has SSD HD of 960GB.
> So we decided to create a second pool that will use only this SSD.
> I have readed Ceph CRUSH & device classes in order to do that!
> So just to do things right, I need check that out:
> 1 - first create OSD's with all HD, SAS and SSD
> 2 - second create different pool with command bellow:
> ruleset:
> ceph osd crush rule create-replicated <rule-name> <root>
> <failure-domain> <class>
> create pool
> ceph osd pool set <pool-name> crush_rule <rule-name>
> Well, my question is: can I create OSD with all disk either SAS and
> SSD, and then after that, create the ruleset and the pool?
> Is this generated some impact during this operations??
If your OSD types aren't mixed, then best create the rule for the
existing pool first. All data will move, once the rule is applied. So,
not much to movement if they are already on the correct OSD type.


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