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From Glen Baars <>
Subject Ceph RBD issues in 4.11
Date Thu, 17 May 2018 11:50:41 GMT
Hello Dev,

I have recently upgraded our cloudstack environment to 4.11. Mostly all has been smooth. (
this environment is legacy from days! )

There are some issues that I have run into:

1.Can't install any VMs from ISO ( I have seen this in the list previously but can't find
a bug report for it ) If further reports or debug will help I can assist. It is easy to reproduce.
2.When a VM is created from a template, the RBD features are lost. More info below.

Example of VM volume from template: -

user@NAS-AUBUN-RK3-CEPH01:~# rbd info AUBUN-KVM-CLUSTER01-SSD/feeb52ec-f111-4a0d-9785-23aadd7650a5

rbd image 'feeb52ec-f111-4a0d-9785-23aadd7650a5':
        size 150 GB in 38400 objects
        order 22 (4096 kB objects)
        block_name_prefix: rbd_data.142926a5ee64
        format: 2
        features: layering
        create_timestamp: Fri Apr 27 12:46:21 2018
        parent: AUBUN-KVM-CLUSTER01-SSD/d7dcd9e4-ed55-44ae-9a71-52c9307e53b4@cloudstack-base-snap
        overlap: 150 GB

Note the features are not the same as the parent : -

user@NAS-AUBUN-RK3-CEPH01:~# rbd info AUBUN-KVM-CLUSTER01-SSD/d7dcd9e4-ed55-44ae-9a71-52c9307e53b4
rbd image 'd7dcd9e4-ed55-44ae-9a71-52c9307e53b4':
        size 150 GB in 38400 objects
        order 22 (4096 kB objects)
        block_name_prefix: rbd_data.141d274b0dc51
        format: 2
        features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
        create_timestamp: Fri Apr 27 12:37:05 2018

If you manually clone the volume the expected features are retained. We are running the latest
Ceph version, KVM hosts on Ubuntu 16.04 with the latest Luminous qemu-img.

Kind regards,
Glen Baars

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