VMware 4817V62 Administration Guide - Page 331

Appendix C Performance Metrics Table C-2. CPU Data Counters (Continued) Counter Label Description VHRC usagemhz CPU Usage in MHz The amount of CPU used, in megahertz, during the interval VM Amount of actively used virtual CPU. This is the host's view of the CPU usage, not the guest operating system view. Host Sum of the actively used CPU of all powered on virtual machines on a host. The maximum possible value is the frequency of the processors multiplied by the number of processors. For example, if you have a host with four 2GHz CPUs running a virtual machine that is using 4000MHz, the host is using two CPUs completely. 4000 ÷ (4 × 2000) = 0.50 used wait CPU Used CPU Wait n Stats Type: rate n Unit: megaHertz n Rollup Type: average(min/max) n Collection Level: 1(4) n VC/ESX: Yes/Yes Amount of used CPU time. n Stats Type: delta n Unit: millisecond n Rollup Type: summation n Collection Level: 3 n VC/ESX: Yes/Yes Amount of CPU time spent in wait state. n Stats Type: delta n Unit: millisecond n Rollup Type: summation n Collection Level: 3 n VC/ESX: Yes/Yes Disk Metrics The disk metric group tracks statistics for disk input/output (I/O) performance. Disk I/O counters support metrics for both physical devices and virtual devices. A host reads data from a LUN (logical unit number) associated with the physical storage media. A virtual machine reads data from a virtual disk, which is the virtual hardware presented to the Guest OS running on the virtual machine. The virtual disk is a file in VMDK format. Table C-3 lists the disk data counters. NOTE Some counters listed in Table C-3 subsume other counters. For example, kernelLatency includes both queueReadLatency and queueWriteLatency and the disk usage statistic include both read and write statistics. In addition, only a subset of the disk counters appear in the overview performance charts. To view all disk data counters, use the advanced performance charts. VMware, Inc. 331