Open Stack

Yes, the instance when running can only use the available resources
from the compute host.

On Mon, Dec 23, 2013 at 1:35 PM, Vikas Parashar <para.vikas at gmail.com> wrote:
> Thanks Cristian,
>
> Will elasticity  be limited to 4 Cores/4GB  (The max capacity of a physical
> host) ?
>
>
> On Mon, Dec 23, 2013 at 5:00 PM, Cristian Falcas <cristi.falcas at gmail.com>
> wrote:
>>
>> Hi,
>>
>> From what I know you can resize a machine, but this involves
>> rebuilding the instance: openstack will create a snapshot of the
>> machine an recreate the instance with the new snapshot and a new
>> flavor. This is not very fast from my experience, so you will have a
>> considerable downtime doing this, depending on the size of the current
>> instance and how fast is your storage.
>>
>> Best regards,
>> Cristian Falcas
>>
>>
>>
>> On Mon, Dec 23, 2013 at 12:03 PM, Vikas Parashar <para.vikas at gmail.com>
>> wrote:
>> > Hi,
>> >
>> > IaaS is all about elastic computing. I can stretch resources as per my
>> > need
>> > - increasing/decreasing the number of cores, RAM allocated etc..
>> >
>> > My question is - how does openStack achieve this elasticity for both
>> > computation and RAM.
>> >
>> > If I create an image with 2 cores and 4 GB RAM (and one day I need to
>> > increase this to, lets say - 6 Cores and 12 GB RAM), but all the
>> > physical
>> > hosts that I currently have (for Compute and RAM) at my disposal have a
>> > max
>> > of 4 Cores and 4 GB RAM each..
>> >
>> > Using openStack -
>> >
>> > a) is this possible (as long as the total cores and total RAM required
>> > is
>> > less than the group-total) ? If yes, how is this achieved.
>> >
>> > b) or the elasticity will be limited to 4 Cores/4GB  (The max capacity
>> > of a
>> > physical host) ? If no, then is it possible to achieve it ?
>> >
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>
>