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
Glispa GmbH | Berlin Office
Managing Director Din Karol-Gavish
Registered in Berlin
AG Charlottenburg | HRB 114678B
–––––––––––––––––––––––––––––
VP IT Operations
+49 (0) 30 555713017 / +49 (0) 152 26814501
skype: flyersa
LinkedIn Profile
LinkedIn Profile
Glispa GmbH | Berlin Office
Managing Director Din Karol-Gavish
Registered in Berlin
AG Charlottenburg | HRB 114678B
–––––––––––––––––––––––––––––
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