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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