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It this case you still will be double rooted, I recommend you:in the beginning, I create separate crush rules for SSD and HDD pool ( six Ceph nodes), following this HOWTO: https://www.sebastien-han.fr/blog/2014/08/25/ceph-mix-sata-and-ssd-within-the-same-box/ Now I want to migrate to the standard crush rules, which comes with Luminous. What is the procedure here ? # ceph osd crush rule create-replicated ssdpool default-ssd host ssd # ceph osd pool set ssd-pool crush_rule ssdpool # ceph osd crush rule create-replicated satapool default-hdd host hdd # ceph osd pool set sata-pool crush_rule satapool and wait, until everything is done ? 1. Assign classes to your osds. 2. Create crush rule for hdd in default root. 3. Set crush rule to your hdd pools. 4. Move your osds from default-hdd to default root. 5. When when data migration is finished and do the same for your ssds. At Final you will be single rooted with device-classes crush rules.
k
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