Hi all,
Context :
Lab Platform
Ceph dumpling and firefly
Ubuntu 12.04 LTS
I encountered a strange behavior managing the crushmap on a dumpling and a firefly ceph platform.
I built a crushmap, adding 2 specific rules (fastrule and slowrule) in order to experiment tiering.
I used "ceph osd get|setcrushmap" and crushtool to extract and ingest the updated crushmap in the system.
I have to precise that I respectively associated 50 and 51 as ruleset numbers for the 2 new rules.
The ingestion was good; I checked it by "ceph osd crush rule dump"
I created 2 pools (fastpool and slowpool)
As indicated in the doc, I tried to associate fastpool to ruleset 50 by "ceph osd pool set fastpool crush_ruleset 50"
an error occurred : rule 50 doesn't exist
As the rule_id of fastrule is 4, I did "ceph osd pool set fastpool crush_ruleset 4" and it works but it's not a correct behavior.
If a ceph admin wants to manage the crushmap, he doesn't have to check the rule_id (that he cannot set) before updating the attribute crush_ruleset of pools.
The way to manage the rules if the ruleset not the rule_id.
I also tested that reingesting a crushmap (after for example changing the sequence of the rules in the decompiled file) causes a global update of the rule_ids.
I can't imagine the impacts on a platform.
Did someone encounter this behavior?
Did I misunderstand how to configure a crushmap?
Best regards
- - - - - - - - - - - - - - - - -
Ghislain Chevalier
ORANGE/OLNC/OLPS/ASE/DAPI/CSE
Architecte de services de stockage
Storage Service Architect
+33299124432
ghislain.chevalier@xxxxxxxxxx
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