Hello list, i have a strange issue creating cephfs subvolumegroup  with  dedicated pools.... We have four fs (volumes); one is "backup" I would like to set up two subvolumegroup  "veeampool" and "bareospool" each with dedicated data pools  "cephfs.backup.veeam.data" and "cephfs.backup.bareos.data".  Both EC42 with overwrites enabled and application cephfs. Pls see below. isceph@ceph-deploy:~$ sudo ceph fs subvolumegroup create backup veeampool  --pool_layout cephfs.backup.veeam.data ...First one is ok.   isceph@ceph-deploy:~$ sudo ceph fs subvolumegroup create backup bareospool --pool_layout cephfs.backup.bareos.data Error EINVAL: Invalid pool layout 'cephfs.backup.bareos.data'. It must be a valid data pool Second one throws this error...   Is there only one data pool allowed per volume? Many thanks for clarification Christoph ...pool ls detail [..] pool 44 'cephfs.backup.meta' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 32 pgp_num 32 autoscale_mode on last_change 1132068 flags hashpspool stripe_width 0 pg_autoscale_bias 4 pg_num_min 16 recovery_priority 5 application cephfs pool 45 'cephfs.backup.data' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 32 pgp_num 32 autoscale_mode on last_change 1132068 flags hashpspool stripe_width 0 application cephfs pool 46 'cephfs.backup.veeam.data' erasure profile ec-42-profile size 6 min_size 5 crush_rule 9 object_hash rjenkins pg_num 64 pgp_num 64 autoscale_mode warn last_change 1174754 lfor 0/0/1174708 flags hashpspool,ec_overwrites stripe_width 16384 application cephfs pool 48 'cephfs.backup.bareos.data' erasure profile ec-42-profile size 6 min_size 5 crush_rule 10 object_hash rjenkins pg_num 64 pgp_num 64 autoscale_mode warn last_change 1176205 flags hashpspool,ec_overwrites stripe_width 16384 application cephfs -- Christoph Ackermann | System Engineer INFOSERVE GmbH | Am Felsbrunnen 15 | D-66119 Saarbrücken Fon +49 (0)681 88008-59 | Fax +49 (0)681 88008-33 | mailto:C.Ackermann@infoserve.de | https://www.infoserve.de INFOSERVE Datenschutzhinweise: https://infoserve.de/datenschutz Handelsregister: Amtsgericht Saarbrücken, HRB 11001 | Erfüllungsort: Saarbrücken Geschäftsführer: Dr. Stefan Leinenbach | Ust-IdNr.: DE168970599