What is Esxtop used for?
Esxtop is a command-line tool that gives administrators real-time information about resource usage in a vSphere environment. With esxtop, an administrator can monitor CPU, disk space, memory and network resource usage. The command can be run either directly at the console or remotely, by using a secure shell console.
How do you use Esxtop commands?
Start esxtop by typing esxtop at the command line. Type v to switch to disk view (virtual machine mode). Press f to modify the fields that are displayed. Press b, d, e, h, and j to toggle the fields and press Enter.
How do you read Esxtop?
Esxtop is used to analyze real-time performance data from an individual ESX or ESXi server. You bring it up by going to the physical server console or remote console via SSH, logging in, and typing esxtop. Most people would say that esxtop analyzes CPU, Memory, Disk, and Network statistics.
What is worlds Esxtop?
The VMware esxtop tool provides a real-time view (updated every five seconds, by default) of ESX Server worlds sorted by CPU usage. The term world refers to processes running on the VMkernel. There are three types of worlds: System: The worlds that are needed to perform various system services.
What is %wait in Esxtop?
I got this question today around %WAIT and why it was so high for all these VMs. %VMWAIT is a derivative of %WAIT, however it does not include %IDLE time but does include %SWPWT and the time the VM is blocked for when a device is unavailable.
What is a high co-stop?
High Percent Co-Stop (%CSTP) Co-Stop (%CSTP) is the percentage of time that a SMP virtual machine was ready to run, but incurred delay due to co-vCPU scheduling contention.
What is CPU ready in vmware?
CPU ready time is a vSphere metric that records the amount of time a VM is ready to use CPU but was unable to schedule physical CPU time because all the vSphere ESXi host CPU resources are busy. CPU ready time is dependent on the number of VMs on the host and their CPU loads.
What causes CO-stop?
As I understand it Co-Stop is caused by having a multiple vCPU VM having to wait for all of its cores of the pCPU to be ready. i.e. If its a 4 vCPU VM it has to wait for 4 cores on the pCPU to be ready in order to complete a cycle.
What are some good counters to use in esxtop?
Now you are inside ESXTOP so lets focus on some good counters to use for performance troubleshooting. When troubleshooting CPU performance for your virtual machines the following counters are the most important. %USED tells you how much time did the virtual machine spend executing CPU cycles on the physical CPU. %RDY is a Key Performance Indicator!
Why does esxtop use a lot of CPU?
In very large environments esxtop can high CPU utilization due to the amount of data that will need to be gathered and calculations that will need to be done.
What does% used mean in esxtop-vfrank?
%USED tells you how much time did the virtual machine spend executing CPU cycles on the physical CPU. %RDY is a Key Performance Indicator! Always start with this one. This one defines how much time your virtual machine wanted to execute CPU cycles but could not get access to the physical CPU.
What should the ready time be in esxtop?
Ready Time (%RDY) is the amount of time a VM is waiting to be scheduled on a physical CPU. I mention above that generally %RDY should be under 10%. This is true, however the values you see in esxtop may be confusing. This is because how you interpret the values is influenced by how many vCPU worlds the virtual machine has.