Calculate IO from the performance graphs

[redsnapper76]

Hello,

Is there a way to calculate the amount of IO's generated by 1 ESX or 1 VM

If you take for example the Disk graph and convert the KBps to MBps, you can use this formula

IOPS = (MBps Throughput / KB per IO) * 1024

So for example I have 1 ESX with a maximum of 15000KBps

Windows Virtual Disks are formatted in 64K blocks, which here would mean with a throughput of

(15MB/Sec / 64KB per IO) * 1024 = 240 IOPS.

For example with 1 VM you have a maximum of 6500 KBps

This means (6.5MB/Sec / 64KB per IO)*1024 = 104 IOPS

I don't think that you should calculate with the block level that you have formatted your lun's.

Lun Block Size: 1MB, 2MB, 4MB or 8MB.

Is this a correct way of approaching this?

Thank you in advance

[chriswahl]

That seems like a lot of work. :smileyhappy:

An easier approach would be to use batch mode on esxtop. The results can be saved and then imported into tools (like perfmon or excel) for reporting.

Here's a good article on how to interpret esxtop.

[idle-jam]

the output from esxtop can be plotted via esxplot which make study easier .. http://labs.vmware.com/flings/esxplot