On Tue, Aug 6, 2024 at 11:55 AM Torkil Svensgaard <torkil@xxxxxxxx> wrote:
>
> 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?
Hi Torkil,
The latter -- the object-map feature is limited to 256000000 objects,
which with 4M objects works out to be ~976T. For anything larger, the
object-map feature can be disabled with "rbd feature disable" command
(would need to temporarily unmap the image if it's mapped).
Thanks,
Ilya
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