Yes but I already have some sort of test cluster with data in it. I don’t think there are commands to modify existing rules that are being used by pools. And the default replicated_ruleset doesn’t have a class specified. I also have an erasure code rule without any class definition for the file system. -----Original Message----- From: Konstantin Shalygin [mailto:k0ste@xxxxxxxx] Sent: woensdag 13 juni 2018 5:59 To: ceph-users@xxxxxxxxxxxxxx Cc: Marc Roos Subject: Re: Add ssd's to hdd cluster, crush map class hdd update necessary? > Is it necessary to update the crush map with > > class hdd > > Before adding ssd's the cluster? Of course, if this osds of one root. It is not necessary to manually edit crush: ceph osd crush rule create-replicated replicated_hosts_hdd default host hdd ceph osd crush rule create-replicated replicated_hosts_nvme default host nvme k _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com