Any feedback ? I would just like to be sure that I am using the right
procedure ...
Thanks, Massimo
On Fri, Jan 20, 2023 at 11:28 AM Massimo Sgaravatto <
massimo.sgaravatto@xxxxxxxxx> wrote:
> Dear all
>
> I have a ceph cluster where so far all OSDs have been rotational hdd disks
> (actually there are some SSDs, used only for block.db and wal.db)
>
> I now want to add some SSD disks to be used as OSD. My use case is:
>
> 1) for the existing pools keep using only hdd disks
> 2) create some new pools using only sdd disks
>
>
> Let's start with 1 (I didn't have added yet the ssd disks in the cluster)
>
> I have some replicated pools and some ec pools. The replicated pools are
> using a replicated_ruleset rule [*].
> I created a new "replicated_hdd" rule [**] using the command:
>
> ceph osd crush rule create-replicated replicated_hdd default host hdd
>
> I then changed the crush rule of a existing pool (that was using
> 'replicated_ruleset') using the command:
>
>
> ceph osd pool set <poolname> crush_rule replicated_hdd
>
> This triggered the remapping of some pgs and therefore some data movement.
> Is this normal/expected, since for the time being I have only hdd osds ?
>
> Thanks, Massimo
>
>
>
> [*]
> rule replicated_ruleset {
> id 0
> type replicated
> min_size 1
> max_size 10
> step take default
> step chooseleaf firstn 0 type host
> step emit
> }
>
> [**]
> rule replicated_hdd {
> id 7
> type replicated
> min_size 1
> max_size 10
> step take default class hdd
> step chooseleaf firstn 0 type host
> step emit
> }
>
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