You can classify osd's, eg as ssd. And you can assign this class to a pool you create. This way you have have rbd's running on only ssd's. I think you have also a class for nvme and you can create custom classes. -----Original Message----- From: Philip Brown [mailto:pbrown@xxxxxxxxxx] Sent: 16 December 2019 22:55 To: ceph-users Subject: Separate disk sets for high IO? Still relatively new to ceph, but have been tinkering for a few weeks now. If I'm reading the various docs correctly, then any RBD in a particular ceph cluster, will be distributed across ALL OSDs, ALL the time. There is no way to designate a particular set of disks, AKA OSDs, to be a high performance group, and allocate certain RBDs to only use that set of disks. Pools, only control things like the replication count, and number of placement groups. I'd have to set up a whole new ceph cluster for the type of behavior I want. Am I correct? -- Philip Brown| Sr. Linux System Administrator | Medata, Inc. 5 Peters Canyon Rd Suite 250 Irvine CA 92606 Office 714.918.1310| Fax 714.918.1325 pbrown@xxxxxxxxxx| www.medata.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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