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...
Sent from my really tiny device... On Dec 23, 2013, at 3:55 AM, "Vikas Parashar" <[email protected]<mailto:[email protected]>> 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 <[email protected]<mailto:[email protected]>> 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 <[email protected]<mailto:[email protected]>> 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 ? > > _______________________________________________ > Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : > [email protected]<mailto:[email protected]> > Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : [email protected]<mailto:[email protected]> Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
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