Hello, Ceph users, what is the best way how to change the storage layout of all buckets in radosgw? I have default.rgw.buckets.data pool as replicated, and I want to use an erasure-coded layout instead. One way is to use cache tiering as described here: https://cephnotes.ksperis.com/blog/2015/04/15/ceph-pool-migration/ Could this be done under the running radosgw? If I read this correctly, it should be done, because radosgw is just another RADOS client. Another possible approach would be to create a new erasure-coded pool, a new zone placement, and set it as default. But how can I migrate the existing data? If I understand it correctly, the default placement applies only to new buckets. Something like this: ceph osd erasure-code-profile set k5m2 k=5 m=2 ceph osd pool create default.rgw.buckets.ecdata erasure k5m2 ceph osd pool application enable default.rgw.buckets.ecdata radosgw radosgw-admin zonegroup placement add --rgw-zonegroup default --placement-id ecdata-placement radosgw-admin zone placement add --rgw-zone default --placement-id ecdata-placement --data-pool default.rgw.buckets.ecdata --index-pool default.rgw.buckets.index --data-extra-pool default.rgw.buckets.non-ec radosgw-admin zonegroup placement default --rgw-zonegroup default --placement-id ecdata-placement How to continue from this point? And a secondary question: what purpose does the data-extra-pool serve? Thanks! -Yenya -- | Jan "Yenya" Kasprzak <kas at {fi.muni.cz - work | yenya.net - private}> | | https://www.fi.muni.cz/~kas/ GPG: 4096R/A45477D5 | We all agree on the necessity of compromise. We just can't agree on when it's necessary to compromise. --Larry Wall