VMware:- Tools for performance monitoring in VMware ESXi
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The main tool for performance monitoring is esxtop, which collects data based on different metrics, for example, host memory usage, network usage, disk usage/IOPs and CPU usage.
Esxtop is just like using top in Linux. It has the same look and feel and provides the same kind of information provided by top tools in Linux. It can be used in real- time performance monitoring of vSphere hosts, and metrics can be monitored for system interruptions, CPU, network, disk device, disk adapter, and memory, each on a dedicated screen. The real-time monitoring can help you to identify different problems, including latency, utilization, and other errors.
Esxtop offers three modes for performance monitoring: interactive, batch, and replay.
For now, all you need to know is that:-
1. The interactive mode can enable live monitoring of vSphere host performance.
2. The batch mode can be used to export data to other tools for offline viewing.
3. In replay mode, you can simulate the resources gathered by vm-support.
Live resource monitoring – the interactive mode:- As you will notice, esxtop is an extensive but simple tool—it takes some time to get familiar with it. First, I will walk you through this step-by-step:-
1️⃣ Connect to a vSphere host using SSH and log in as root or an administrative user.
2️⃣ In the command prompt, type esxtop without any flags.
3️⃣ It will take you to a statistics console, as displayed in Figure attached in this post.
4️⃣ Let's examine the different screens presented by esxtop. By default, the first screen that appears displays CPU information. You can use the option c to see this screen.
5️⃣ Press i to see the Interrupts screen. Press c to go back to the CPU information screen.
6️⃣ Press m to view the Memory screen. This screen displays detailed information about memory usage. I will walk you through this in a while in this chapter. Press c again to go back to the previous screen.
7️⃣ To examine network usage, press n. It will show you ports are being used and will present different statistics about network traffic.
8️⃣ Press d for detailed information about the disk adapter.
9️⃣ For disk information, press u, and this will take you to the disk information screen. You can find all the information about available storage (local, includes NFS as of 4.0 Update 2, VMFS, iSCSI) to your vSphere host. It will also present the usage, disk read and write, and some other information.
1️⃣0️⃣ Pressing v will take you to the disk VM screen, where you can find more information about the virtual machine's disk.
1️⃣1️⃣ Pressing p will display the CPU Power screen, where CPU power consumption and other power-related statistics can be monitored.
Esxtop is just like using top in Linux. It has the same look and feel and provides the same kind of information provided by top tools in Linux. It can be used in real- time performance monitoring of vSphere hosts, and metrics can be monitored for system interruptions, CPU, network, disk device, disk adapter, and memory, each on a dedicated screen. The real-time monitoring can help you to identify different problems, including latency, utilization, and other errors.
Esxtop offers three modes for performance monitoring: interactive, batch, and replay.
For now, all you need to know is that:-
1. The interactive mode can enable live monitoring of vSphere host performance.
2. The batch mode can be used to export data to other tools for offline viewing.
3. In replay mode, you can simulate the resources gathered by vm-support.
Live resource monitoring – the interactive mode:- As you will notice, esxtop is an extensive but simple tool—it takes some time to get familiar with it. First, I will walk you through this step-by-step:-
1️⃣ Connect to a vSphere host using SSH and log in as root or an administrative user.
2️⃣ In the command prompt, type esxtop without any flags.
3️⃣ It will take you to a statistics console, as displayed in Figure attached in this post.
4️⃣ Let's examine the different screens presented by esxtop. By default, the first screen that appears displays CPU information. You can use the option c to see this screen.
5️⃣ Press i to see the Interrupts screen. Press c to go back to the CPU information screen.
6️⃣ Press m to view the Memory screen. This screen displays detailed information about memory usage. I will walk you through this in a while in this chapter. Press c again to go back to the previous screen.
7️⃣ To examine network usage, press n. It will show you ports are being used and will present different statistics about network traffic.
8️⃣ Press d for detailed information about the disk adapter.
9️⃣ For disk information, press u, and this will take you to the disk information screen. You can find all the information about available storage (local, includes NFS as of 4.0 Update 2, VMFS, iSCSI) to your vSphere host. It will also present the usage, disk read and write, and some other information.
1️⃣0️⃣ Pressing v will take you to the disk VM screen, where you can find more information about the virtual machine's disk.
1️⃣1️⃣ Pressing p will display the CPU Power screen, where CPU power consumption and other power-related statistics can be monitored.
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