[lago-devel] Re: Snapshot with memory of Engine/host VMs?

On Tue, May 22, 2018 at 1:27 PM, Milan Zamazal <mzamazal(a)redhat.com&gt; wrote: > Yaniv Kaul <ykaul(a)redhat.com&gt; writes: > >> On Fri, May 18, 2018 at 11:48 PM, Milan Zamazal <mzamazal(a)redhat.com&gt; 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?