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On 5/10/2016 5:14 PM, Chris Friesen wrote:
> On 05/10/2016 03:51 PM, Matt Riedemann wrote:
>> For the libvirt imagebackend refactor that mdbooth is working on, I
>> have a POC
>> devstack-gate change which runs with the lvm imagebackend in the
>> libvirt driver
>> [1].
>>
>> The test results are mostly happy except for anything related to migrate
>> (including resize to same host) [2][3].
>>
>> That's because we're not testing with boot from volume [4].
>>
>> This is a weird capability wrinkle that is not clear from the API,
>> you'll only
>> find out that you can't migrate/resize on this host that's using lvm
>> when it
>> fails. We can't even disable this in tempest really since there isn't
>> a flag for
>> 'only-supports-resize-for-volume-backed-instances'. So this job would
>> just have
>> to disable any tests that have anything to do with resize/migrate,
>> which kind of
>> sucks since that's what we wanted to test going into the libvirt
>> imagebackend
>> refactor.
>
>
> For what it's worth, we've got internal patches to enable cold migration
> and resize for LVM-backed instances.  We've also got a proof of concept
> to enable thin-provisioned LVM to get rid of the huge
> wipe-volume-on-deletion cost.
>
> Pretty sure we'd be happy to contribute these if there is interest.
> Last time I brought up some of these there didn't seem to be much.
>
> Chris
>
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I'd be interested if you want to push the changes up as a WIP, then we 
could run my devstack-gate change with your series as a dependency and 
see what kind of fallout there is.

I also need to check of there are any tempest tests that test 
resize/migrate from a volume-backed instance and if those are passing on 
this.

-- 

Thanks,

Matt Riedemann