New iSER Driver installation on ESXi 6.5-U1


We have tried to install the new iSER driver ( on ESXi 6.5 U1.

But only the software iSCSI shows up in the storage adapter list. The iSER adapter is not visible.

The configuration is as follows:



    • ESXi 6.5-U1 Build 5969303
    • Mellanox Drivers native drivers

The installation of the new iSER drivers is successful and we have issued the following command to ensure that the driver is loaded on boot:

esxcli system module set --enabled=true --module=iser

All the hosts boot normally and

esxcfg-module -g iser


iser enabled = 1 options = ‘’

However just to check, after booting if we issue the following command the first time:

vmkload_mod iser

We get:

Module iser loaded successfully

Which leads to believe that the module was not loaded automatically

Launching the same command a second time leads to:

vmkload_mod: Can not load module iser: module is already loaded

On all 5 hosts we are not able to see the iSER adapter even after several reboots.

The network adapters are connected to a vDS:

Any clue or procedure to clean install everything in order to bring up the iSER adapter ?

Thanks !

We’re on the same boat.

I want to use PFC based iSER on ESXi 6.5 environment.

Here are some therads.

Question about ESXi 6.5 iSER driver with PFC port configuraion.

iSER driver for ESXi 6.5 - Does it support ConnectX-3 or not

Good luck to like us who want to use iSER on ESXi 6.5.

Best Regard,

Jae-Hoon Choi

Unfortunately answer is no!

But my friend said to me a info some works in advanced.

He test with StarWind vSAN iSER Target and ESXi 6.5 iSER initiator ( connect to iSER Target.

He test with RoCE v1.0, 1.2x, 2.0.

In near future, I’ll test what RoCE version is support with ESXi 6.5 iSER driver.


Jae-Hoon Choi

You must add iSER adapter on ESXi console, not a software iSCSI adapter.

If you execute esxcli rdma iser add command then you will see a iSER adapter.

But if you reboot ESXi host iSER adapter will disappear…

Therefore you should be add a esxcli rdma iser add to /etc/rc.local.d/

I’m also test with my SCST iSER Target, but fail to connect to iSER Target

My Friend also test with LIO Target, StarWind iSER Target, but everytime failed to connect to iSER Target.

My friend use iSER with for ESXi 6.0 driver - that support only ESXi 6.0 - on ESXi 6.0 host successfully.

I think this iSER driver for ESXi 6.5 is a beta level addon module…:(

Best Regard,

Jae-Hoon Choi

Thanks Jae-Hoon !

I can now see the iSER adapters.

Will try to hook the host to some iSER targets later and post the results here.

I hope it can work with the switch ports configured with PFC instead of Global Pause.

any luck seeing the iser target? i am pretty much where you guys are, i have the adapter but cannot see the target.