Can´t create snapshots on images, mimic, newest patches, CentOS 7

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Hello,

 

i have a small ceph cluster running with CentOS 7.5

 

Ceph release is:

 

ceph --version

ceph version 13.2.1 (5533ecdc0fda920179d7ad84e0aa65a127b20d77) mimic (stable)

 

I have one pool with 13 images. All images have same features enabled and are used by a openshift origin 3.9 as client.

For three out of 13 images in the same pool, I can´t create snapshots – not via the gui nor via cli.

 

The problem was also there with v. 13.2.0.

 

As we use the krbd from the standard CentOS kernel, I am not able to do mirroring and need the snapshot feature
to do some backups.

As I am pretty new into ceph, I don´t know exactly, how I can debug the problem further.

 

Thanks

Alex

 

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