[pve-devel] [PATCH V2] - fix setting migration parameters

[Alexandre DERUMIER]

> Cleaner code. Nobody expects that those values were set at vm start. 

>>We set that since version 1.0 - so 'everybody' expect that this value is set at startup. 

I agree with stefan, this value should be set before migration.

currently, we can't change the migrate_downtime without restart the vm.

(example:
 I have a migration which take to much time because of too low migrate_downtime value, 
 I stop the migration, 
 I increase the migrate_downtime, 
 I restart the migration)



----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Stefan Priebe - Profihost AG" <s.priebe at profihost.ag> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Jeudi 27 Décembre 2012 07:27:29 
Objet: Re: [pve-devel] [PATCH V2] - fix setting migration parameters 

> Cleaner code. Nobody expects that those values were set at vm start. 

We set that since version 1.0 - so 'everybody' expect that this value is set at startup. 

> >> - lower default migration downtime value to 0 
> > 
> > We do not want that, because this is known to cause long wait times on 
> busy VMs. 
> 
> A value of 1 does not work for me. Whole vm stalls immediately and socket 
> is unavailable. Migration than takes 5-10 minutes of an idle vm. 

So this is a qemu bug - we should try to fix that. 

Else any VM which use migrate_downtime is broken! 

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