On 06/08/2024 12:37, Ilya Dryomov wrote:
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,
Hi Ilya
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, we'll do that.
Mvh.
Torkil
Thanks,
Ilya
--
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@xxxxxxxx
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