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Hi Matt,

In Liberty, we introduced allow_availability_zone_fallback [1] option in
Cinder config as fix for bug [2]. If you set this option, Cinder will
create volume in a default AZ instead of set volume into the error state

[1]
https://github.com/openstack/cinder/commit/b85d2812a8256ff82934d150dbc4909e041d8b31
[2] https://bugs.launchpad.net/cinder/+bug/1489575

Regards,
Ivan Kolodyazhny

On Wed, Sep 23, 2015 at 9:00 PM, Matt Riedemann <mriedem at linux.vnet.ibm.com>
wrote:

> I came across bug 1496235 [1] today.  In this case the user is booting an
> instance from a volume using source=image, so nova actually does the volume
> create call to the volume API.  They are booting the instance into a valid
> nova availability zone, but that same AZ isn't defined in Cinder, so the
> volume create request fails (since nova passes the instance AZ to cinder
> [2]).
>
> I marked this as invalid given how the code works.
>
> I'm posting here since I'm wondering if there are alternatives worth
> pursuing.  For example, nova could get the list of AZs from the volume API
> and if the nova AZ isn't in that list, don't provide it on the volume
> create request.  That's essentially the same as first creating the volume
> outside of nova and not specifying an AZ, then when doing the boot from
> volume, provide the volume_id as the source.
>
> The question is, is it worth doing that?  I'm not familiar enough with how
> availability zones are meant to work between nova and cinder so it's hard
> for me to have much of an opinion here.
>
> [1] https://bugs.launchpad.net/nova/+bug/1496235
> [2]
> https://github.com/openstack/nova/blob/master/nova/virt/block_device.py#L381-L383
>
> --
>
> Thanks,
>
> Matt Riedemann
>
>
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