Install and Configure the Dell Multipath Extension Module on ESXi

This article explains how to install the Dell Multipath Extension module on ESXi 4.1 and ESXi 5.0. The Dell Multipath Extension Module (MEM) is used to setup ESXi servers to communicate with an Equallogic array. It will setup iSCSI vSwitches and create a custom “equallogic” path selection policy. You will need to download the Equallogic Multipath Extension Module from the equallogic website. In this example have saved the download to c:\software\equallogic.

ESXi 4.1 Installation

You will also need to have downloaded and installed the VMware CLI tool. Open the CLI and enter the below commands.

C:\software\Equallogic\VmwareMEM\ –install –server X.X.X.X –bundle=C:\software\Equallogic\VmwareMEM\

You will need to reboot

C:\software\Equallogic\VmwareMEM\ –configure -server=X.X.X.X

You will be prompted for information on your desired iSCSI setup as shown below

If you look in VI Client you will see it has created the below vSwitch.

The below command will change the path selection policy for your existing LUNs as well as any LUNs created in the future

C:\software\Equallogic\VmwareMEM\ –enable –server=X.X.X.X

Notice the custom Dell path selection policy – optimised for vmware.

I would recommend rebooting again and checking the vSwitches are still there. I have come across a bug in dell systems whereby vSwitch information is lost after rebooting for the first time.

ESXi 5.0 Installation

  • You will need to download the Equallogic MEM version 1.1 or later.
  • You will also need v5.0 of the vSphere CLI –
Enter the below commands to create the iSCSI vSwitches:- –configure –server=”hostname”
You then need to upload the Equallogic MEM .zip file to the ESXi host datastore






Then enter the below command to install the MEM

esxcli –server=”hostname” software vib install -d//vmfs/volumes/[datastore]/ dell-eql-mpio-<version>.zip






You should then reboot the server or issue this command at the console

/etc/init.d/hostd restart


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