I just recently did the same. Take into account that everything starts migrating. How weird it maybe, I had hdd test cluster only and changed the crush rule to having hdd. Took a few days, totally unnecessary as far as I am concerned. -----Original Message----- From: Enrico Kern [mailto:enrico.kern@xxxxxxxxxx] Sent: maandag 20 augustus 2018 11:18 To: ceph-users@xxxxxxxxxxxxxx Subject: Set existing pools to use hdd device class only Hello, right now we have multiple HDD only clusters with ether filestore journals on SSDs or on newer installations WAL etc. on SSD. I plan to extend our ceph clusters with SSDs to provide ssd only pools. In luminous we have devices classes so that i should be able todo this without editing around crush map. In the device class doc it says i can create "new" pools to use only ssds as example: ceph osd crush rule create-replicated fast default host ssd what happens if i fire this on an existing pool but with hdd device class? I wasnt able to test thi yet in our staging cluster and wanted to ask whats the way todo this. I want to set an existing pool called volumes to only use osds with hdd class. Right now all OSDs have hdds. So in theory it should not use newly created SSD osds once i set them all up for hdd classes right? So for existing pool running: ceph osd crush rule create-replicated volume-hdd-only volumes default hdd ceph osd pool set volumes crush_rule volume-hdd-only should be the way to go right? Regards, Enrico -- Enrico Kern VP IT Operations enrico.kern@xxxxxxxxxx +49 (0) 30 555713017 / +49 (0) 152 26814501 skype: flyersa LinkedIn Profile <https://www.linkedin.com/in/enricokern> <http://goog_59398030/> <https://www.glispa.com/> Glispa GmbH | Berlin Office Stromstr. 11-17 <https://goo.gl/maps/6mwNA77gXLP2> Berlin, Germany, 10551 <https://goo.gl/maps/6mwNA77gXLP2> Managing Director Din Karol-Gavish Registered in Berlin AG Charlottenburg | <https://maps.google.com/?q=Sonnenburger+Stra%C3%9Fe+73+10437+Berlin%C2%A0%7C+%3Chttps://maps.google.com/?q%3DSonnenburgerstra%25C3%259Fe%2B73%2B10437%2BBerlin%25C2%25A0%257C%25C2%25A0Germany%26entry%3Dgmail%26source%3Dg%3E%C2%A0Germany&entry=gmail&source=g> HRB 114678B ––––––––––––––––––––––––––––– _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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