Don't miss out on new posts! Sign up!
vSphere 6.5

Upgrade Dell VMware ESXi 6.0 Cluster to 6.5 U1 with VUM

With many today either upgrading or planning on upgrading their VMware vSphere 6.0 generation clusters to 6.5 Update 1, most are probably starting to form a game plan to get clusters upgraded.  Of course, the first thing that has to happen as with every vSphere upgrade, you have to get your vCenter Server 6.5 server in place.  For most this will mean upgrading their VCSA 6.0 appliance to a VCSA 6.5 U1 appliance.  We have detailed the upgrade process here.  We have covered upgrading ESXi 6.0 to ESXi 6.5 as well in this post.  Today, however, I want to cover a few concepts of things to do and look for when we Upgrade Dell VMware ESXi 6.0 cluster to 6.5 U1 with VUM.

Backup Dell VMware ESXi Host Configuration

It is always smart to backup your host configuration before you begin running the upgrade process.  Yes, we can simply reload a host if the worst happens.  However, recreating configuration, especially if we are using Standard vSwitches can be a pain.

We can backup Dell VMware ESXi host configuration by using PowerCLI.  Using the commandlet Get-VMHostFirmware we can extract the configuration and save it off to a safe location.  If something bad happens with the upgrade to ESXi 6.5 update 1, we can easily reload the host and then restore the configuration we extracted.

Use the syntax:

  • Get-VMHostFirmware -VMHost <Host IP or FQDN> -BackupConfiguration -DestinationPath <Destination directory>

Use official Dell VMware ESXi 6.5 Update 1 Media

Most of the hardware vendors common in today’s enterprise datacenters produce a “customized ISO” of VMware ESXi that contains all the hardware specific device drivers needed to make sure there are no problems with the installation of the update.  Dell is no exception to this as they produce customized ISOs for VMware ESXi.  The latest version of the Dell Customized ESXi ISO can be found by searching for drivers and downloads for the service tag of your Dell PowerEdge server.

It is extremely important to use the customized version of the ISO from your vendor as this can drastically alleviate problems with the ESXi 6.5 upgrade.  Check out

Download Dell Customized ISO

Upgrade Dell Firmware for all devices

It is always best practice to upgrade your device firmware to the latest levels to make sure you have the latest bug fixes, etc.  Additionally, the latest firmware ensures that you are in a supported condition if you call Dell up with an issue as most know the first question you are asked in a support situation is “have you upgraded the firmware?”.

Do yourself a favor and boot into the Lifecycle controller and run the available firmware updates for your system.  The nice thing about the Lifecycle controller is you can pull the firmware updates directly down through the Dell FTP server, so no booting from a disk.  The Lifecycle controller is intuitive and the upgrade process is fairly automated once you select and kick off the available updates.

Dell Lifecycle Controller Firmware updates

Create a Dell Customized ESXi 6.5 Upgrade Baseline in VUM

In Update Manager, when we Upgrade Dell VMware ESXi 6.0 Cluster to 6.5 U1 with VUM, we need to import our Dell Customized ISO into VUM and then create a baseline to apply against our host(s) in the cluster.  This allows us to scan our hosts and remediate them based on the custom upgrade baseline.  In Admin view go to the ESXi Images tab and then select the Import ESXi Image option.

Dell Lifecycle Controller Firmware updates

Browse to the image you want to import and begin the upload.

Copying up the Dell Customized ISO to VUM

Create a Host Baseline to apply the new custom ISO

Click on the Hosts Baselines tab and select the New Baseline button.

Create an upgrade baseline using the customized ISO

This begins the New Baseline wizard.  Select the Host Upgrade radio button.

Create a new host upgrade baseline

Next, we choose the ISO image that we just uploaded to VCSA VUM.

Choose the Dell ESXi customized ISO image for the baseline

Finish out the new baseline.

Finish out the new upgrade baseline

Attach the Upgrade Baseline and Remediate the ESXi Host

We should see the newly created baseline available to us in the Hosts Baselines tab.  When we Upgrade Dell VMware ESXi 6.0 Cluster to 6.5 U1 with VUM, we attach the baseline and remediate our hosts using the customized ISO.

The new baseline appears in VUM

Now, we want to attach the baseline to our host.  Click the Attach Baseline button.

Attach the baseline to the host

Select the new Upgrade Baseline that was created.

Choose the newly created upgrade baseline

Now that we have attached the baseline, we need to scan the host.  Click the Scan for Updates button.

Scan the host that has the baseline attached

Select Upgrades.

Scan for upgrades

As we scan the host now, we can see we are Non-Compliant on the new custom upgrade baseline, which is what we want.  Select the Remediate button.

The host is not compliant on the new upgrade baseline

This launches the Remediate wizard.  Select the Upgrade Baselines and select the custom upgrade baseline.

Select the upgrade baseline to remediate

Select the host to remediate.

Select the target object

Accept the EULA agreement.

EULA Agreement

In the Advanced options we can choose to schedule the upgrade.  So if we want to be hands off, we can schedule it and let it roll.

Advanced options

There are some great options in the Host remediation options.  We can disable removable media, and select how we want to handle maintenance mode failures.

Host remediation options

In a cluster configuration, you will want to Disable High Availability admission control if it is enabled for any of the selected clusters.

Cluster remediation options

We are ready to complete the Remediate wizard.

Completing the remediation wizard


Hopefully the concepts presented here will help anyone looking to Upgrade Dell VMware ESXi 6.0 Cluster to 6.5 U1 with VUM.  The process is very straightforward and with a little preparation work such as backing up your configuration and upgrading all firmware, you can feel confident about the upgrade process.  From my experience so far with the newly integrated VUM with 6.5 U1, it has been rock solid and I have not run into issues.

Don't miss out on new posts! Sign up!

Brandon Lee

Brandon Lee is the Senior Writer, Engineer and owner at and has over two decades of experience in Information Technology. Having worked for numerous Fortune 500 companies as well as in various industries, Brandon has extensive experience in various IT segments and is a strong advocate for open source technologies. Brandon holds many industry certifications, loves the outdoors and spending time with family.

Related Articles

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.