Apologies for the empty reply to this I seem to have sent. I blame my phone :o
This process can be somewhat automated with crushtool’s reclassification directives, which can help avoid omissions or typos (/me whistles innocently): https://docs.ceph.com/en/latest/rados/operations/crush-map-edits/#migrating-from-a-legacy-ssd-rule-to-device-classes > On Nov 28, 2024, at 2:53 AM, Eugen Block <ebl...@nde.ag> wrote: > > Of course it's possible. You can either change this rule by extracting the > crushmap, decompiling it, editing the "take" section, compile it and inject > it back into the cluster. Or you simply create a new rule with the class hdd > specified and set this new rule for your pools. So the first approach would > be: > > 1. ceph osd getcrushmap -o crushmap.bin > 2. crushtool -d crushmap.bin -o crushmap.txt > 3. open crushmap.txt with the editor of your choice, replace > > step take default > with: > step take default class hdd > > and save the file. > > 4. crushtool -c crushmap.txt -o crushmap.new > 5. test it with crushtool: > > crushtool -i crushmap.new --test --rule 1 --num-rep 5 --show-mappings | less > crushtool -i crushmap.new --test --rule 1 --num-rep 5 --show-bad-mappings | > less > > You shouldn't have bad mappings if everything is okay. Inspect the result of > --show-mappings to see if the OSDs match your HDD OSDs. > > 6. ceph osd setcrushmap -i crushmap.new > > #### > > Alternatively, create a new rule if your EC profile(s) already have the > correct crush-device-class set. If not, you can create a new one, but keep in > mind that you can't change the k and m values for a given pool, so you need > to ensure that you use the same k and m values: > > ceph osd erasure-code-profile set ec-profile-k3m2 k=3 m=2 > crush-failure-domain=host crush-device-class=hdd > > ceph osd crush rule create-erasure rule-ec-k3m2 ec-profile-k3m2 > > And here's the result: > > ceph osd crush rule dump rule-ec-k3m2 | grep -A2 take > "op": "take", > "item": -2, > "item_name": "default~hdd" > > Regards, > Eugen > > Zitat von Rok Jaklič <rjak...@gmail.com>: > >> Hi, >> >> is it possible to set/change following already used rule to only use hdd? >> { >> "rule_id": 1, >> "rule_name": "ec32", >> "type": 3, >> "steps": [ >> { >> "op": "set_chooseleaf_tries", >> "num": 5 >> }, >> { >> "op": "set_choose_tries", >> "num": 100 >> }, >> { >> "op": "take", >> "item": -1, >> "item_name": "default" >> }, >> { >> "op": "chooseleaf_indep", >> "num": 0, >> "type": "host" >> }, >> { >> "op": "emit" >> } >> ] >> } >> >> Kind regards, >> Rok >> _______________________________________________ >> ceph-users mailing list -- ceph-users@ceph.io >> To unsubscribe send an email to ceph-users-le...@ceph.io > > > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
