The good Herr Bock is spot on.
> On Aug 3, 2025, at 3:30 AM, Eugen Block <ebl...@nde.ag> wrote: > > Hi, > > this is well known, years ago this was discussed on this list as well. One > could argue that since it's not supported to change the EC parameters of a > pool, you shouldn't change the profile. But the EC profile is only referenced > during pool creation, so you can edit the profile and create *new* pools with > it, this will show accordingly in the pool details output. But the more > important part is the crush rule, of course. It defines where the chunks will > be placed. So you should be good, but I'd still double test the PG placement > (ceph pg ls-by-pool <pool>) and confirm the required resiliency as well by > shutting down one or two datacenters. > > But please take this information with a grain of salt, it has been years > since I last looked into this, we usually don't change EC profiles. I am just > assuming that nothing has changed in this regard. > > Regards, > Eugen > > Zitat von Niklas Hambüchen <m...@nh2.me>: > >> I made an EC 4+2 cluster with `crush-failure-domain=host`. >> >> Later after adding more machines, I changed it from `host` to `datacenter`: >> >> ceph osd erasure-code-profile set my_ec_profile_datacenter k=4 m=2 >> crush-failure-domain=datacenter crush-device-class=hdd >> ceph osd crush rule create-erasure rule_my_data_ec_datacenter >> my_ec_profile_datacenter >> ceph osd pool set my_data_ec crush_rule rule_my_data_ec_datacenter >> >> This seems to have worked, and `ceph osd pool get my_data_ec crush_rule` >> outputs: >> >> crush_rule: rule_my_data_ec_datacenter >> >> But `ceph osd pool ls detail` still shows >> >> pool 3 'my_data_ec' erasure profile my_ec_profile ... >> >> with `my_ec_profile` instead of `my_ec_profile_datacenter`. >> >> Is this a problem? >> Who wins, the profile or the crush-rule? >> >> If it's not a problem, it is at least confusing; can I fix it somehow? >> >> Thanks! >> Niklas >> _______________________________________________ >> 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
