The Relationship Between SDN and Cloud Computing
July 17, 2014
Grazed from Global Knowlege. Author: John Hale.
Cloud computing has been around now for several years. To set the stage for the problem I’ll discuss in this post, here’s what has happened so far:
1. Everything was physical, leading to silos of expertise and lots of wasted resources (CPU, memory, network, and disk)
2. VMware’s vSphere, Microsoft’s Hyper-V, Red Hat’s KVM, etc., came along and virtualized those four key resources for each VM, but while CPU and memory have virtualized and scaled well, network and disk provisioning have lagged behind. In addition, VMs were manually deployed as requested after networking and storage were prepared and configured as needed. Storage was somewhat simplified by using virtual hard disks, but networking remained a bigger issue as VLANs and other settings needed to be set up…
3. Cloud computing came along and automated much of the process for provisioning a new VM, giving control to the end user or administrator or developer (self-service provisioning). While that made VM deployments much simpler and faster, they were often held up with networking issues. Often, the system could pick from a pool of available VLANs, but that really limited scalability (there are just over 4,000 VLANs possible)…
Read more from the source @ http://blog.globalknowledge.com/headline/the-relationship-between-sdn-and-cloud-computing/