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As far as I understood, the chain is the same - admin extend volume by 
using Cinder, but unlike earlier implementation, if volume is in-use, 
Cinder will ask Nova whether Nova support extending attached volumes (by 
checking Nova's API microversion) and if yes, will resize volume 
informing Nova using "volume-extended" call. On Nova's side, it will 
inform QEMU about this change... then either user can manually resize or 
it will happen on next reboot.

I can be wrong, of course, but there is no neither "nova volume-extend" 
nor word "extend" in "nova --help" :-)

On 9/26/17 5:35 PM, John Petrini wrote:
> I think this feature is actually implemented in nova. So you have to 
> use the nova volume-extend option to do what you want. This is just my 
> interpretation of the release notes though. I haven't tried it.
>
>
> On Tue, Sep 26, 2017 at 10:20 AM, Volodymyr Litovka <doka.ua at gmx.com 
> <mailto:doka.ua at gmx.com>> wrote:
>
>     Hi Jay,
>
>     I know about this way :-) but Pike introduced ability to resize
>     attached volumes:
>
>     "It is now possible to signal and perform an online volume size
>     change as of the 2.51 microversion using
>     the|volume-extended|external event. Nova will perform the volume
>     extension so the host can detect its new size. It will also resize
>     the device in QEMU so instance can detect the new disk size
>     without rebooting." --
>     https://docs.openstack.org/releasenotes/nova/pike.html
>     <https://docs.openstack.org/releasenotes/nova/pike.html>
>
>     On 9/26/17 5:04 PM, Jay Pipes wrote:
>>     Detach the volume, then resize it, then re-attach.
>>
>>     Best,
>>     -jay
>>
>>     On 09/26/2017 09:22 AM, Volodymyr Litovka wrote:
>>>     Colleagues,
>>>
>>>     can't find ways to resize attached volume. I'm on Pike.
>>>
>>>     As far as I understand, it required to be supported in Nova,
>>>     because Cinder need to check with Nova whether it's possible to
>>>     extend this volume.
>>>
>>>     Well,
>>>     - Nova's API microversion is 2.51, which seems to be enough to
>>>     support "volume-extended" API call
>>>     - Properties of image are *hw_disk_bus='scsi'* and
>>>     *hw_scsi_model='virtio-scsi'*, type bare/raw, located in Cinder
>>>     - hypervisor is KVM
>>>     - volume is bootable, mounted as root, created as snapshot from
>>>     Cinder volume
>>>     - Cinder's backend is CEPH/Bluestore
>>>
>>>     and both "cinder extend" and "openstack volume set --size"
>>>     returns "Volume status must be '{'status': 'available'}' to
>>>     extend, currently in-use".
>>>
>>>     I did not find any configuration options neither in nova nor in
>>>     cinder config files, which can help with this functionality.
>>>
>>>     What I'm doing wrong?
>>>
>>>     Thank you.
>>>
>>>     -- 
>>>     Volodymyr Litovka
>>>        "Vision without Execution is Hallucination." -- Thomas Edison
>>>
>>>
>>>
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>>
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>
>     -- 
>     Volodymyr Litovka
>        "Vision without Execution is Hallucination." -- Thomas Edison
>
>
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>

-- 
Volodymyr Litovka
   "Vision without Execution is Hallucination." -- Thomas Edison

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