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VMware vSphere 6 : What’s New – Multi-CPU Fault Tolerance (FT)

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One of things holding many companies back from moving their tier 1 business critical applications across to VMware’s vSphere virtualized platform has been its inability to provide fault tolerance (FT) for virtual machines (VMs) running more than one virtual CPU (vCPU), with many applications, particularly those of the tier 1 variety, requiring more than a single vCPU.

Up until vSphere 6, it has only been possible to provide real-time fault tolerance for single vCPU VMs.  What this meant for those VMs with FT enabled, and the applications running on them, is that they could sustain a host level failure, with a shadow copy of the VM being run, and constantly kept in sync (i.e.: vCPU, vRAM, etc) on a second physical ESXi host. So, if the primary instance of the VM was to fail, due to a hardware fault or similar to the underlying ESXi host, then the secondary/shadow instance would automatically become the primary, thereby providing little, to no, disruption to the end user.  At this time a new secondary instance would be created on another functioning ESXi host in the cluster.  This VM level FT could be achieved within vSphere through a simple few clicks of the mouse, much easier (and often cheaper) than trying to configure most application or OS level clustering software.

To learn more and to read the entire article at its source, please refer to the following page, VMware vSphere 6 : What’s New – Multi-CPU Fault Tolerance (FT)- TechHead

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