How do you read Esxtop output?

To monitor storage performance per HBA:

1. Start esxtop by typing esxtop at the command line.
2. Press d to switch to disk view (HBA mode).
3. To view the entire Device name, press SHIFT + L and enter 36 in Change the name field size.
4. Press f to modify the fields that are displayed.

How do you check Esxtop?

Press any key other than a through x to see the esxtop display again. Note: You can also run esxtop in batch mode. For example, use the command: [root]# esxtop -b -n iterations > logfile. For detailed command reference information, enter man esxtop on the SSH command line.

What is RDY in Esxtop?

Ready, %RDY: This value represents the percentage of time that the virtual machine is ready to execute commands, but has not yet been scheduled for CPU time due to contention with other virtual machines.

How do you sort Esxtop?

Press ‘R’ to sort by %RDY column. The percentage of time the vCPU world is in an idle loop. %IDLE is only available for vCPU worlds. Other worlds do not have idle loops, so %IDLE is 0.

What is the use of Esxtop command?

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.

What is a high co stop value?

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.

How much CPU Ready is too much?

CPU ready time is dependent on the number of VMs on the host and their CPU loads. It is normal for a VM to average between 0–50 ms of CPU ready time; anything over 1000 ms is considered to lead to VM performance problems.

What is considered high CPU ready time?

It is normal for a guest to average between 0–50ms of CPU ready time, which is called the “guest heartbeat.” Anything over 300ms can lead to performance problems. On average, up to 300ms CPU Ready Time is acceptable, with a high water mark of 500ms.

What is a requirement of storage I O control?

Storage I/O Control has several requirements and limitations. Datastores that are Storage I/O Control-enabled must be managed by a single vCenter Server system. Storage I/O Control is supported on Fibre Channel-connected, iSCSI-connected, and NFS-connected storage. Raw Device Mapping (RDM) is not supported.

What do the Numa Statistics in esxtop mean?

The first number list the total amount of machine memory in the NUMA node that is managed by ESX, the statistic displayed within the round brackets is the amount of machine memory in the node that is currently free. Let’s explore NUMA statistics in esxtop a little bit more based on this example.

How do I view NUMA statistics?

Esxtop memory NUMA statistics show the memory location of each VM. Start esxtop, press m for memory view, press f for customizing esxtop and press f to select the NUMA Statistics.

How much local memory does a NUMA node have?

For example 16GB will be assigned to each NUMA node on a two socket server with 32GB total physical. A quick way to confirm the local memory configuration of the NUMA nodes is firing up esxtop. Esxtop will only display NUMA statistics if ESX is running on a NUMA server.

What is the difference between Numa and ESX?

ESX is NUMA aware and tries to ensure memory locality, but when a VM is configured outside the NUMA node limits, ESX will not apply NUMA node optimizations. While a VM still run correctly without NUMA optimizations, it can experience slower memory access.