VMware Performance Metrics

Overview

This article covers the various VMware performance metrics displayed by the Performance Analysis Dashboard and Performance Analysis Overview, and how to interpret different metric values and combinations of values across different VMware metrics for SQL Sentry.

VMware Host Metrics

Section	Metric	Description
Network	IN	The percent of network bandwidth across the VMHost used for downloads. Mode: S, H Type: Percent
Network	OUT	The percent of network bandwidth across the VMHost used for uploads. Mode: S, H Type: Percent
CPU Usage	Total CPU	The total amount of CPU used across the VM as a percent. Mode: S Type: Percent
CPU Usage	Co-stop %	Co-Stop time measures when a virtual machine is ready to run, but unable to run due to co-scheduling constraints. See blog on VMware Advisory Conditions in SQL Sentry for more information. Mode: H Type: Percent
CPU Usage	Ready Time %	Percentage of time when a vCPU is ready to do work, but must wait for the hypervisor to schedule that work on one or more physical CPUs. CPU ready time is a summation, and is dependent on the number of virtual machines on the host and their CPU loads. See the blog on VMware Advisory Conditions in SQL Sentry for more information. Mode: H Type: Percent
System Memory	Active	Amount of memory that is actively used, as estimated by VMkernel based on recently touched memory pages. Mode: S, H Type: MB
System Memory	Consumed	Amount of machine memory used on the host. Consumed memory includes memory used by the service console, the VMkernel, vSphere services, and the total consumed metrics for all running virtual machines. Mode: S, H Type: MB
System Memory	Overhead	Total of all overhead metrics (including VM overhead and VMKernel overhead) for powered-on virtual machines, and the overhead of running vSphere services on the host. Mode: S, H Type: MB
System Memory	Granted	Amount of machine memory or physical memory that's mapped for the host. Mode: S, H Type: MB
System Memory	Available	Amount of machine memory or physical memory that's available for the host. Mode: S, H Type: MB
System Memory	Swap In	The percentage of memory read in by the VMkernel swap file from memory to disk across all the virtual machines on the VMHost. Mode: S, H Type: Percent
System Memory	Swap Out	The percentage of memory written by the VMKernel swap file from memory across all the virtual machines on the VMHost. Mode: S, H Type: Percent
Disk IO	ms/ Read by Datastore	The amount of time it takes in milliseconds for the VMHost to read data from each Logical Unit Number (LUN) on the datastore. Mode: S, H Type: ms
Disk IO	ms/ Write by Datastore	The amount of time it takes in milliseconds for the VMHost to write data from each Logical Unit Number (LUN) on the datastore. Mode: S, H Type: ms
Disk IO	MB/sec Read by Datastore	The amount of data in megabytes read by the VMHost from each Logical Unit Number (LUN) on the datastore per second. Mode: S, H Type: MB
Disk IO	MB/sec Write by Datastore	The amount of data in megabytes written to the VMHost from each Logical Unit Number (LUN) on the datastore per second. Mode: S, H Type: MB

VMware Guest Metrics

Section	Metric	Description
Network (VM)	IN per Guest	The amount of network bandwidth in megabytes per second used for downloads by the VM Guest(s). Mode: S, H Type: MB per second
Network (VM)	OUT per Guest	The amount of network bandwidth in megabytes per second used for uploads by the VM Guest(s). Mode: S, H Type: MB per second
CPU Usage (VM)	Utilization Per Guest	The percentage of CPU used by the VM per guest. Mode: S, H Type: Percentage
System Memory (VM)	Utilization per Guest	The amount of system memory in megabytes actively used by each VM Guest. Mode: S, H Type: MB
Disk IO (VM)	ms/Read per VM	The average amount of time it takes in milliseconds for the VM to read data from the virtual disk. Mode: S, H Type: ms
Disk IO (VM)	ms/Write per VM	The average amount of time it takes in milliseconds for the VM to write data to the virtual disk. Mode: S, H Type: ms
Disk IO (VM)	MB/sec Read per VM	The average amount of data used for reads by each VM in megabytes per second. Mode: S, H Type: MB per second
Disk IO (VM)	MB/sec Write per VM	The average amount of data used for writes by each VM in megabytes per second. Mode: S Type: MB per second