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 ?
It this case you still will be double rooted, I recommend you:
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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