[Openstack] VM resize time comparison

Chathura M. Sarathchandra Magurawalage 77.chathura at gmail.com
Tue Jul 26 10:30:42 UTC 2016


Thanks Tomas.

Yes you are right but that will only happen when you resize disk at each step. But when I increased CPU other resource were kept fixed. So in This case, it won’t be copying bigger disk over each time.


> On 26 Jul 2016, at 08:45, Tomas Vondra <vondra at czech-itc.cz> wrote:
> 
> Chathura M. Sarathchandra Magurawalage <77.chathura at ...> writes:
> 
>> 
>> Hi, 
>> 
>> Does anyone know the reason for VM resizing time to increase faster if you
> continuously increase CPU or DISK
>> resources by +1 (e.g. 1-2, 2-3, 3-4, 4-5). Whereas, when you increase from
> 1 to any of +1/+2/+3/+4…..+n
>> (e.g. 1-2, 1,3, 1-4, 1-5), the VM resize time still increases at each
> step, but it takes less time in
>> comparison to the former method. Can anyone give an explanation for this? 
>> 
> 
> Hi!
> If I'm correct, the resize operation stops the VM, migrates it to another
> computed node and starts it with another configuration there.
> So if you have your VM running on local storage, moreover raw local storage,
> you will be copying a bigger disk over each time. Otherwise, it should not
> matter. Am I correct about your configuration?
> Tomas
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