Thursday, January 12, 2012

iSCSI Multipathing (MPIO) on ESXi 5

On my last post I was talking about iSCSI Multipathig and how things work.

Today I will give you some information about how it works on ESXi 5.

The concept about it is pretty much the same, if you dont know it check my post about it, on ESXi 5 there’s a few changes that worth to mention.

First thing you would notice is the iSCSI Software, is not present on the list of Storage Adapters anymore.

It’s because it’s not installed by default.
So, click "add" to install iSCSI software on your host.

But the biggest improvement is the ability to bind the VMkernel adapter through a GUI, which means no more command lines to bind them.

On the iSCSI Properties you will see a new tab “Network Configuration” then you just need to add the port you will use for the iSCI communication.

It’s done.

You just need to configure the Discovery targets and scan your hosts.

Much better now right….what you are waiting to migrate to ESXi 5 ?!?!?


K Davis said...

What is the best way to test if mpio is working correctly? I have setup to work with 2 different iscsi server but I am not 100% if it is doing what it is supposed be. Should I see a big jump in performance?

Eduardo Meirelles da Rocha said...

Hi K Davis, sorry the delay, just now I realized you comment.
Well, the whole point it to access your device with more than one interface.
I'm assuming you dedicate more than one uplink just for the isci traffic. You could check the performance on esxtop to see if there's traffic on both uplinks, also the performance tab could give you the same information. Most of the storage devices have monitoring tools, if yours have you can check if there's more than one connection stablish from your host.

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I’m an IT specialist with over 15 years of experience, working from IT infrastructure to management products, troubleshooting and project management skills from medium to large environments. Nowadays I'm working for VMware as a Consulting Architect, helping customers to embrace the Cloud Era and make them successfully on their journey. Despite the fact I'm a VMware employee these postings reflect my own opinion and do not represents VMware's position, strategies or opinions. Reach me at @dumeirell

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