Quick datacenter power consumption quiz:
Q: How much power does an idle server consume?
A: Way more than a powered-off server.
VMware vSphere saves energy — and money — in your datacenter by powering off unused hosts during off-peak periods. Take a look at this new technical paper on VMware DPM that covers the technology in-depth.
Despite competitor claims, this powerful capability is unique to VMware vSphere.
Imitation: The highest form of flattery
Red Hat Enterprise Virtualization has a seemingly-similar feature called Power Saver that also consolidates virtual machines onto fewer hosts. However, the RHEV solution stops there — hypervisor hosts simply sit idle with no running VMs; they are not powered off. No word yet on what the moon and stars in this diagram have to do with an idle host:
Red Hat claims that an idle host requires just 10-15% of the power required for a host with running VMs. That sounds very generous if you ask me. Frankly, from the looks of my HP C7000 BladeSystem Onboard Administrator power summaries, it seems quite false.
Update: Bob Plankers actually measured the power consumption of a Dell server in a few different scenarios and found that idle systems still draw significant amps.
Red Hat claims their new virtualization product is “best in class.” Really? Which class?