How To Change Default IOP Limit

After my last blog post, I realised I hadn’t actually walked you threw how to change the default IOP limit used by Round Robin.

To crack on and do this we need a SSH client such as Putty

Each change, only has to be made per Datastore which makes things a little easier.

SSH to your ESXi Host and enter your credentials.  We are going to run the command to give us the Network Address Authority names of our LUN’s.

esxcli storage nmp device list | grep naa

A quick look in the vSphere Web Client shows us which Datastores the NAA belong too.

In my case, I want to change the settings for all of the Datastores.  So we will start by checking the current multi path policy to ensure it’s set to Round Robin and the default IOP maximum limit.  Let’s run the following command:

esxcli storage nmp psp roundrobin deviceconfig get -d naa.6000eb3b4bb5b2440000000000000021

A bit like ‘Blue Peter’ here is one I did earlier! Not very helpful.

Let’s run the same command again but for a different NAA.

Excellent, to change the default maximum IOP limit to 1 enter this command

esxcli storage nmp psp roundrobin deviceconfig set -d naa.6000eb39c167fb82000000000000000c –iops 1 –type iops

To check, everything is ‘tickety boo’ enter

esxcli storage nmp device list | grep policy

You should see that each Datastore default maximum IOP limit is set at 1