Yedidyah Bar David <didi@redhat.com> writes:

> On Tue, May 22, 2018 at 1:27 PM, Milan Zamazal <mzamazal@redhat.com> wrote:
>> Yaniv Kaul <ykaul@redhat.com> writes:
>>
>
>>> On Fri, May 18, 2018 at 11:48 PM, Milan Zamazal <mzamazal@redhat.com> wrote:
>>>
>>>> Hi, I have been playing with using Lago snapshots to restart oVirt
>>>> system tests from a certain point without all the preceding
>>>> initialization and tests.  The primary purpose is to save time when
>>>> running a suite over different data center compatibility versions but it
>>>> could be also useful e.g. when writing and debugging tests.

>>>>
>>>> However since `lagocli snapshot' makes disk-only snapshots the VMs get
>>>> restarted when they are reverted.  This may cause various problems.  For
>>>> instance, when I snapshot/revert before running add_dc test then
>>>> verify_notifier test fails -- I assume due to the event being initiated
>>>> before the snapshot and completed after the snapshot, so it's missing in
>>>> after-revert runs.  Snapshots with memory should resolve similar issues.
>>>> Is it possible to make such snapshots in Lago?

>>>>
>>>
>>> It's not entirely clear to me that this will work well for all flows.
>>> For example, I don't anticipate network connections (storage, storage,
>>> storage...) to persist well.
>>> This will make the whole exercise pointless, regretfully. (or in other
>>> words: this is when I gave up on the same idea).

>
> I think for some time now about doing this too, but start earlier - mainly
> to test different setup-related flows. Can you see some obvious problem
> with this, that should make me give up already?
>
> Any of you has example patches for OST to try playing with this?

I use disk-only snapshots, as provided by Lago, in
https://gerrit.ovirt.org/91169 .  It doesn't work reliably yet, but it's
usable as a proof of concept.

> Sadly I didn't manage so far to make OST run on my machines [1], I only use
> it in CI.
>
> [1] https://lists.ovirt.org/archives/list/infra@ovirt.org/message/QGYRKBBLD4MUNY7HEDD7E6CPSF4B4ECI/
>
>>
>> I see, right, it's most likely not going to work reliably.  I'll rather
>> try to handle regular snapshots and related tweaks.
>>
>> Thanks,
>> Milan
>>
>>>> I'd also like to clarify how is `lagocli revert' supposed to be used.
>>>> It seems to basically work as such but I could experience network
>>>> accessibility problems of the reverted Lago VMs.  lagocli stop + revert
>>>> + start seems to be a safer way of reverting to a snapshot.  How should
>>>> `lagocli revert' be used properly?

>>>>
>>>> Thanks,
>>>> Milan
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