How to create a new pool with EC4+2 on hdd

Create the EC pool

ceph osd pool create <poolname> 32 32 erasure profile-4-2-hdd
ceph osd pool set <poolname> crush_rule ecrule-4-2-hdd


ceph osd pool set <poolname> allow_ec_overwrites true

Create the metadata pool in replica3:

 ceph osd pool create metadata-<poolname> 32 32
 ceph osd pool set metadata-<poolname> crush_rule replicated_hdd

How to create a  pool in replica 3 which uses a specific device class

Assumo che ci siano gia' degli OSD che sono stati messi nella device class hdd-cephfs (v. PDCL-2592)

[root@ceph-mon-01 ~]# ceph osd crush rule create-replicated replicated_hdd-cephfs default host hdd-cephfs