Yes.
It is a hybrid solution where a placement group is always located on one
NVMe drive and two HDD drives. Advantage is great read performance and
cost savings. Disadvantages is low write performance. Still the write
performance is good thanks to rockdb on Intel Optane disks in HDD servers.
Real world looks more like I described in a previous question
(2018-01-23) here on ceph-users list, "Ruleset for optimized Ceph hybrid
storage". Nobody answered so am guessing it is not possible to create my
wanted rule. Now am trying to solve it with virtual datacenters in the
crush map. Which works but maybe the the most optimal solution.
On 2018-01-29 13:21, Wido den Hollander wrote:
On 01/29/2018 01:14 PM, Niklas wrote:
...
Is it your intention to put all copies of a object in only one DC?
What is your exact idea behind this rule? What's the purpose?
Wido
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