Hi [ceph: root@ceph-flash1 /]# rbd info rbd_ec/projects rbd image 'projects': size 750 TiB in 196608000 objects order 22 (4 MiB objects) snapshot_count: 0 id: 15a979db61dda7 data_pool: rbd_ec_data block_name_prefix: rbd_data.10.15a979db61dda7 format: 2 features: layering, exclusive-lock, object-map, fast-diff, deep-flatten, data-pool op_features: flags: create_timestamp: Thu Jul 7 10:57:13 2022 access_timestamp: Thu Jul 7 10:57:13 2022 modify_timestamp: Thu Jul 7 10:57:13 2022 We wanted to resize it to 1PB but that failed: [ceph: root@ceph-flash1 /]# rbd resize rbd_ec/projects --size 1024T Resizing image: 0% complete...failed. rbd: shrinking an image is only allowed with the --allow-shrink flag 2024-08-06T08:42:01.053+0000 7fc996492580 -1 librbd::Operations: New size not compatible with object map We can do 800T though: [ceph: root@ceph-flash1 /]# rbd resize rbd_ec/projects --size 800T Resizing image: 100% complete...done. A problem with the --1024T notation? Or we hitting some sort of size limit for RBD? Mvh. Torkil -- Torkil Svensgaard Sysadmin MR-Forskningssektionen, afs. 714 DRCMR, Danish Research Centre for Magnetic Resonance Hvidovre Hospital Kettegård Allé 30 DK-2650 Hvidovre Denmark Tel: +45 386 22828 E-mail: torkil@drcmr.dk