krbd doesn't yet support several RBD features, including journaling
[1]. The only current way to use object-map, fast-diff, deep-flatten,
and/or journaling features against a block device is to use "rbd
device map --device-type nbd <image-spec>" (or use a TCMU loopback
device to create an librbd-backed SCSI block device).

On Fri, Jan 11, 2019 at 1:20 AM Hammad Abdullah
<hammad.abdul...@xgrid.co> wrote:
>
> Hey guys,
>
> I'm trying to mount a ceph image with journaling, layering and exclusive-lock 
> features enabled (it is a mirror image) but I keep getting the error "feature 
> not supported". I upgraded the kernel from 4.4 to 4.18 but I still get the 
> same error message. Any Idea what the issue might be?
>
> screenshot attached.
>

[1] http://docs.ceph.com/docs/master/rbd/rbd-config-ref/#rbd-features

-- 
Jason
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