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Re: qemu hook: event for source host too



I could launch `lvchange -asy` on the source host manually, but the aim of hooks is to automatically execute such commands and avoid human errors.

Le 22 janvier 2020 09:18:54 GMT+01:00, Michal Privoznik <mprivozn redhat com> a écrit :
On 1/21/20 9:10 AM, Guy Godfroy wrote:
Hello, this is my first time posting on this mailing list.

I wanted to suggest a addition to the qemu hook. I will explain it
through my own use case.

I use a shared LVM storage as a volume pool between my nodes. I use
lvmlockd in sanlock mode to protect both LVM metadata corruption and
concurrent volume mounting.

When I run a VM on a node, I activate the desired LV with exclusive lock
(lvchange -aey). When I stop the VM, I deactivate the LV, effectively
releasing the exclusive lock (lvchange -an).

When I migrate a VM (both live and offline), the LV has to be activated
on both source and target nodes, so I have to use a shared lock
(lvchange -asy). That's why I need a hook event on the source host too
(as far as I know after my tests, the migration event is only triggered
on the target host).

Is such a feature a possibility?

In theory yes. But since you are the one initiating migration, can't you
also issue the lvchange command?
On the other hand, we already have startup hooks so the argument is only
partially valid - anybody starting up a domain can run the hook too.

Michal

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