VMware ESXTOP Commands for Storage Monitoring

ESXTOP Commands

Troubleshooting storage performance issues can be difficult. ESXTOP Command tool can help.

Note: Alway check with your storage vendor for assistance before spending too much time trying to solve storage issues. The differences between NAS, NFS, SAN, iSCSI is enormous and requires expertise.

 

Command Strings and Switches

I thought I’d post some useful CLI ESXTOP commands to help with monitoring storage for when you start having performance problems resulting from over subscribed storage.

1. Monitor overall storage performance per HBA:

esxtop

d

f

b,c,d,e,h,j

s,2

2. Monitor storage performance per LUN: *

esxtop

u

f

b,c,f,h

s,2

3. Monitor storage performance per VM: *

esxtop

v

f

b,d,e,h,j

s,2

* These options are only available in ESX 3.5 and greater.

The columns we are going to pay attention to are CMDS/s, DAVG/cmd, KAVG/cmd and GAVG/cmd. Below is a brief description of each of these
values.

CMDS/s:

This is the number of IOPS or Input/Output Operations Per Second being sent to or coming from the device or VM being monitored.

DAVG/cmd:

This is the average response time in milliseconds per command being sent to the device.

KAVG/cmd:

This is the amount of time the command spends in the VMkernel.

GAVG/cmd:

This is the response time as it is perceived by the guest OS.

For more ESXTOP Commands related to ESXi 4 – 5 please read VMware KB: Using EXSTOP

About 

I enjoy helping VMware Beginners and New IT Managers learn best practices, virtualization concepts, and cloud basics.

Comments

  1. chuck farah says

    what do these do?
    b,c,d,e,h,j is there any documentation that shows or tells you what these mean…i could not find anything on vmwares web site…

  2. harsha says

    Hi,
    Want to know if there is a way to configure esxtop so that we can gather statistics on a particular device and not on all the devices when we use ‘u’ in interactive mode.

  3. titomane says

    Hi,

    nice job, a little criptic but after trying everything is evident you made me think not apply ;)

    sheers,

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