Here we are in part two of the Q&A series, where I’m working through the multitude of questions that were asked during the recent ‘What’s new in Windows Server 2016 Preview’ JumpStart course, which, if you haven’t heard, is now available on-demand, so check it out! In this post, I’ll be walking through the questions focused around Failover Clustering and High Availability. There was lots of interest in this topic, especially around the new Compute and Storage resiliency, along with enhancements to Shared VHDX. On to the questions…
Will Windows Server 2016 Hyper-V support Fault Tolerance?
No, Fault Tolerance, a feature within certain editions of VMware vSphere, is not a feature within Windows Server 2016. Taking information from the VMware vSphere Availability Guide, whilst attractive on paper, protection of VMs is still limited to only 4 vCPU, and whilst this is enough for many workloads, Fault Tolerance cannot protect against application failures within the VM, cannot reduce downtime for patching-related outages within the guest operating system, and, the feature itself has resource requirements that can create additional overhead. Read that as ‘takes a performance hit’. You also lose flexibility, as the use of Memory Overcommit, and Hot-Add of disks is disabled.