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 <eblock@xxxxxx> 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 <rjaklic@xxxxxxxxx>: > >> 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@xxxxxxx >> To unsubscribe send an email to ceph-users-leave@xxxxxxx > > > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
 |