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Difference between controller iops and disk iops

  • 19 March 2018
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Hi

Can anyone tell me what is the difference between the controller IOPS and disk IOPS? is controller IOPS all the traffic from VMs goign through CVMs and disk includes some other stuff none-VM related?

I don't understand how some time Controller IOPs is higher than disks and some times it's the opposite.

Thanks
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Best answer by aluciani 3 April 2018, 14:04

Hi @AlexR

Let me know if this helps any:

Basically the difference is that the Controller IOPS is pulled directly from stargate, so that reports what the front end sees. The Disks IOPS on the other hand is pulled directly from the disks, so it reports what the backend sees.

Things like memory cache hits means that the front end may be higher then the backend, and things like read-ahead could make the backend see more reads then the front end.

Also check out the Nutanix Bible - Search for Controller Layer - you should find additional information. 👍
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Hi @AlexR

Let me know if this helps any:

Basically the difference is that the Controller IOPS is pulled directly from stargate, so that reports what the front end sees. The Disks IOPS on the other hand is pulled directly from the disks, so it reports what the backend sees.

Things like memory cache hits means that the front end may be higher then the backend, and things like read-ahead could make the backend see more reads then the front end.

Also check out the Nutanix Bible - Search for Controller Layer - you should find additional information. 👍

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