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<div>Nope, u can over provision on most all of the resources (CPU, ram, disk) u described there. Ram is the tricky one as the Linux oom killer may start to get involved when u push the ram limits to high. But there is nothing stopping u from running 8 or more
vms on a box, depending on the over provision ratio u are ok with...<br>
<br>
Sent from my really tiny device...</div>
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On Dec 23, 2013, at 3:55 AM, "Vikas Parashar" <<a href="mailto:para.vikas@gmail.com">para.vikas@gmail.com</a>> wrote:<br>
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<div dir="ltr">Thanks Cristian,
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<div><span style="font-family:arial,sans-serif;font-size:12.800000190734863px">Will elasticity be limited to 4 Cores/4GB (The max capacity of a physical host) ?</span><br>
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<div class="gmail_quote">On Mon, Dec 23, 2013 at 5:00 PM, Cristian Falcas <span dir="ltr">
<<a href="mailto:cristi.falcas@gmail.com" target="_blank">cristi.falcas@gmail.com</a>></span> wrote:<br>
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Hi,<br>
<br>
>From what I know you can resize a machine, but this involves<br>
rebuilding the instance: openstack will create a snapshot of the<br>
machine an recreate the instance with the new snapshot and a new<br>
flavor. This is not very fast from my experience, so you will have a<br>
considerable downtime doing this, depending on the size of the current<br>
instance and how fast is your storage.<br>
<br>
Best regards,<br>
Cristian Falcas<br>
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On Mon, Dec 23, 2013 at 12:03 PM, Vikas Parashar <<a href="mailto:para.vikas@gmail.com">para.vikas@gmail.com</a>> wrote:<br>
> Hi,<br>
><br>
> IaaS is all about elastic computing. I can stretch resources as per my need<br>
> - increasing/decreasing the number of cores, RAM allocated etc..<br>
><br>
> My question is - how does openStack achieve this elasticity for both<br>
> computation and RAM.<br>
><br>
> If I create an image with 2 cores and 4 GB RAM (and one day I need to<br>
> increase this to, lets say - 6 Cores and 12 GB RAM), but all the physical<br>
> hosts that I currently have (for Compute and RAM) at my disposal have a max<br>
> of 4 Cores and 4 GB RAM each..<br>
><br>
> Using openStack -<br>
><br>
> a) is this possible (as long as the total cores and total RAM required is<br>
> less than the group-total) ? If yes, how is this achieved.<br>
><br>
> b) or the elasticity will be limited to 4 Cores/4GB (The max capacity of a<br>
> physical host) ? If no, then is it possible to achieve it ?<br>
><br>
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