The vSphere Fault Tolerance feature does not support more than one vCPU. Why is support for multiple vCPUs in Fault...
By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.
Tolerance so desirable?
Fault Tolerance (FT) is a feature that delivers the highest level of availability in a VMware environment. FT gives uninterrupted service even if a VM fails.
But this protection comes at a cost. To supply constant uptime, FT requires at least two virtual machines (primary and secondary) running on two hardware ESXi servers. In addition to the added cost required to double the amount of host resources, a business needs to supply additional networking to enable FT. Due to the cost of additional hardware, most enterprises do not want to implement FT on all the virtual machines in the environment.
FT is ideal for VMs that are business critical, such as Exchange mail servers or database servers. Those workloads typically run with more than one vCPU to handle the heavy usage demands. Because FT still only supports a single vCPU virtual machine, the only alternative is to configure VMware High Availability, which results in a short downtime if a server fails and a VM is restarted.
Multiple vCPU FT exists, but it has been mired in a technical preview state for quite some time. There has been no announced date for when it will be available in vSphere, but there is speculation it will be released some time in 2014.
Related Q&A from Rob Bastiaansen
Setting up the performance counters in the vSphere client can help troubleshoot a dropped packets issue.continue reading
A user with an XP VM has a few options to try to connect that VM to the Mac host.continue reading
How do you handle virtual machines when making a transition from a standard switch to a virtual distributed switch?continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.