Hello!
We have a Ceph cluster with 30 HDD 4 TB in 6 hosts, only for RBD.
Now, we're receiving other 6 servers with 6 SSD 2 TB each and we want to
create a separate pool for RBD on SSD, and let unused and backup volumes
stays in HDD.
I have some questions:
As I am only using "replicated_rule". ¿If I add an SSD OSD to the
cluster, Ceph starts to migrate PGs to it?
If so, to prevent this, first I have to create rule like
# ceph osd crush rule create-replicated pool-hdd default host hdd
and then
#ceph osd pool set rbd crush_rule pool-hdd
?
Or, if Ceph does not mix automatically hdd and ssd, I create the SSD OSD
and then
# ceph osd crush rule create-replicated pool-ssd default host ssd
# ceph osd pool create pool-ssd 256 256 ssdpool
?
And then migrate images from one to another pool as needed.
Any thoughts are wellcome!
Thanks in advanced for your time.
Javier.-
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