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Hi all,
I built a CRUSH map, with the goal to distinguish between SSD and HDD storage machines using only 1 root. The map can be found here: http://pastebin.com/VQdB0CE9
The issue I am having is this:
root@ceph2:~/crush_files# crushtool -i crushmap --test --show-utilization --rule 0 --num-rep 3
rule 0 (replicated_ruleset_ssd), x = 0..1023, numrep = 3..3 rule 0 (replicated_ruleset_ssd) num_rep 3 result size == 0: 84/1024 rule 0 (replicated_ruleset_ssd) num_rep 3 result size == 1: 437/1024 rule 0 (replicated_ruleset_ssd) num_rep 3 result size == 2: 438/1024 rule 0 (replicated_ruleset_ssd) num_rep 3 result size == 3: 65/1024
And then the same test using num-rep 46 (the lowest possible number that shows full utilization):
root@ceph2:~/crush_files# crushtool -i crushmap --test --show-utilization --rule 0 --num-rep 46
rule 0 (replicated_ruleset_ssd), x = 0..1023, numrep = 46..46 rule 0 (replicated_ruleset_ssd) num_rep 46 result size == 3: 1024/1024
Full output of above commands can be found here http://pastebin.com/2mbBnmSM and here http://pastebin.com/ar6SAFnX
The fact that amount of num-rep seems to scale with how many OSDs I am using, leads me to believe I am doing something wrong.
When using 2 roots (1 dedicated to SSD and 1 to HDD), everything works perfectly (example: http://pastebin.com/Uthxesut).
Would love to know what I am missing.
Thanks!
- Rob
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