Fault Tolerance Performance Counters The fault tolerance charts contain information about CPU and memory for fault tolerant virtual machines. Note The performance charts and help topics for fault tolerance are available only when you have fault tolerance enabled. If you select a link for a secondary virtual machine in the thumbnail section of the Resource Pools and Virtual Machines view of the cluster Performance tab, the navigation in the inventory updates to the primary virtual machine. This occurs because secondary machines are not displayed in the inventory. Subtopics CPU (MHz) CPU System Time for vCPU (%) CPU Used Time for vCPU (%) Memory Active (MB) Memory Swapout (MB) Storage I/O Control Aggregate IOPs Storage I/O Control Normalized Latency Read IOPs by Virtual Machine Disk Write IOPs by Virtual Machine Disk Write Latency by Virtual Machine Disk Read Latency by Virtual Machine Disk