I seriously recommend this blog from Rackspace to those who are so caught up in cloudy-cluster-off-premises-corporate talk.
This rising complexity and cost on the multi-tenant cloud is hitting customers in four main ways:
- They spend more on engineering time and talent to architect for failure on the multi-tenant cloud, which is complex and hard.
- They also spend more on engineering to deal with inconsistent performance, which is even harder.
- They spend more on infrastructure, because over-provisioning is one of the major ways to compensate for inconsistent performance.
- They spend more through the virtualization tax, which can diminish disk and network performance by 5 percent to 20 percent.
KEEP your existing hardware as a live back up for when it starts raining in the cloud. Better yet, build in cost for new hardware on your rack over the next year to lower costs / maintenance and get some experience in building and operating your own in-house cloudy thing.