'horizontal' and 'vertical' dials is a good idea to define. @Andy, I'm a little confused on the definition of horizontal saleability. Aren't the cpus in a single operating image a vertical workload capacity much like the amount RAM . If the number of images scaled, that would be horizontal because there is no necessity for the images to be the same workload set. I would prefer to see the dials tied to a standard "meter of work". An efficiency metric instead of an "equivalence" of cpu count and ghz and RAM amount. Juggling these dials may not be as effectual as the consumer perceives when a provider decide to throttle back performance and starts dropping workload requests. Without a referenced "effective workload" metric, it may be tough to ascertain if the dials effect anything, other than the charge to the customer. gary Randy Bias wrote:
On Oct 25, 2009, at 5:38 PM, Sam Johnston wrote:
A better approach to scalability is to have a single object which you can both adjust the resources of (vertical scalability) and adjust the number of instances of (horizontal scalability). That is, you start a single instance with 1 core and 1Gb, then while it's running you crank it up to 2 cores and 2Gb. Eventually you max out at say 8 cores and 16Gb so you need to go horizontal at some point. Rather than create new unlinked instances the idea is that you would simply adjust the
I agree. This is the future. Dials for 'horizontal' and for 'vertical', probably attached to a given tier of an application.
Just as an FYI, I think 'scale-up' VMs are going to be more and more common. We'll see VMs with a *lot* more RAM and cores very soon now. Most of the modern OSes handle hotplug of CPU/RAM pretty well.
Best,
--Randy
Randy Bias, Founder & Cloud Strategist, Cloudscaling +1 (415) 939-8507 [m], randyb@cloudscaling.com mailto:randyb@neotactics.com BLOG: http://cloudscaling.com/blog
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