Ceph

Hello Stefan,

This is probably rbd default feature problem. Hammer suports: layering, strippingV2, exclusive_Lock and object_map, Jewel has additional: fast_diff, deep_flatten and journalin.

Looking on default parameters:
Hammer: rbd_default_features = 3
Jewel: rbd_default_features = 61

You can fix your issue in to ways:

First, choose what features do you want to enable, to be as much similar to Jewel defaults, I would propose "13".

1. Proivde propper rbd feature set to rbd when creating image (by name):
rbd --conf /etc/ceph_cd10k/ceph.conf create --image-format 2 CD10K_ONE/stefan-test-v2 --size 10240 --image-feature layering,object-map,exclusive-lock

2. Add line below to your /etc/ceph_cd10k/ceph.conf file (by number):
[client]
rbd default format = 2
rbd default features = 13

Then you could create you image simply by:
rbd --conf /etc/ceph_cd10k/ceph.conf create CD10K_ONE/stefan-test-v2 --size 10240

The number "13" is a bit representation of enabled features, in hammer you have:
LAYERING = 1
STRIPINGV2 = 2
EXCLUSIVE_LOCK = 4
OBJECT_MAP = 8

So, for "13" = (1 + 4 + 8), layering + exclusive-lock + object-map.

Looking on Jewel default: 61 = (1 + 4 + 8 + 16 + 32), additional fast_diff and deep_flatten is enabled
FAST_DIFF = 16
DEEP_FLATTEN = 32
JOURNALIN = 64

Regards,
Igor.

@Igor Gajowiak: I can confirm that your suggestion (adjusting feature bit client side) fixes the issue. Thanks for the quick response and explanation!