In my research I need to use automatic scaling in both dimensions: horizontal and vertical. I found some works regarding horizontal scaling performance in cloud providers and hypervisors but nothing about vertical scaling overhead. I need scaling the VMs at run time.
Vertical can take more size than horizontal and its costly but you have to take one of them.
Hello Rapheal,
Vertical Scaling is a type of scaling where the resources of a VM are dynamically increased/decreased on demand.This is called Balloning in Xen.
While creating a VM, Max RAM Limit, Default RAM limit is obtained from User.
When Demand increases, User can dynamically increase current RAM up to MAX RAM limit as mentioned earlier.
When ever load decreased, user shall scale down.
But the community say it as a Nasty Work and they suggest not to go for Vertical Scaling.Another reason is that, increasing memory of one VM, will affect other VM's running on the Server.
See these links for ballooning in Xen
http://lowendbox.com/blog/how-to-tell-your-xen-vps-is-overselling-memory/
https://blogs.oracle.com/rscott/entry/changing_a_domain_s_memory
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Srikrishnan
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