Cannot remediate host because it is part of HA Admission Control enabled Cluster

Recently my team and I ran into incident with and error while patching esxi servers using VMware Update Manager(VUM).  When attempting o remediate the following error message was shown:

“cannot remediate host because it is part of HA Admission Control enabled Cluster”


vCenter Server uses admission control to ensure that sufficient resources are available in a cluster to provide failover protection and to ensure that virtual machine resource reservations are respected.

Admission control imposes constraints on resource usage and any action that would violate these constraints is not permitted. If an automated process needs to take actions, it might temporarily violate the failover constraints.



Before patching of the ESXi Servers that are part of the HA Cluster, make sure you have disabled “Admission Control”. Once server has been patched you can re-enable Admission Control on the cluster.


Steps to disable Admission Control

  • Right-click the cluster and click Edit Settings.
  • Under Cluster Features, click VMware HA.
  • Under Admission Control, select Disable: Power on VMs that violate availability constraints.
  • Click OK

This can also be disabled in the VMware Update Manager remediation wizard. When you remediate check the option “Disable High Availability admission control if it is enabled for any of the selected clusters.


In Place Upgrade Of Windows Server 2008 R2 Standard

If you have a need to upgrade a server running Windows Server 2008 R2 Standard to either the Enterprise, or Datacenter edition, it’s possible to do so online, without re-installing Windows. This not only a simple process, it saves you time.

Open an elevated command prompt and type DISM /Online /Get-CurrentEdition. This returns the current Windows version.

Type DISM /Online /Get-TargetEditions to list the Windows editions to which this server can be upgraded to.

Type DISM /Online /Set-Edition:ServerDataCenter /ProductKey:xxxxxx will upgrade the operating system. All that’s required to complete the upgrade is a reboot.


Ref Info:

DISM Windows Edition-Servicing Command-Line Options – https://technet.microsoft.com/en-us/library/hh825157.aspx

KMS Client Setup Keys – Link

VMware: vCenter Server Appliance 6.0 Update 1

That time has come, when you upgrade vCenter 6.0.  Here are some quick simple steps to see this done.

As always, its a good idea to have a backup before proceeding.  In my case I used a snapshot of my appliance. This was done by me connecting directly to the ESXi and creating a snapshot.

And here are the steps to start this process:

  1. Download the VCSA 6.0 Update 1 from  the VMware Patch Download Website. File-name: VMware-vCenter-Server-Appliance-
  2. Mount the VCSA 6.0 Update 1 Patch ISO to your VCSA 6.x appliance. I attached the ISO by logging into the ESXi and then attaching to the guest appliance
  3. Next is to be logged into the VCSA 6.x appliance via SSH – note this must be an admin account.  I used the local root user and password
  4. Run the following command to begin the installation process: software-packages install –iso –acceptEulas

  5. When completed issue the reboot command: shutdown reboot -r “Updated, thanks to my buddy jermsmit”


Congrats you have upgraded.

Info sources:

VMware KB – for additional info

William Lam – who’s tweet informed me of this release, thanks dude


I hope you enjoyed this post, thanks for visiting – jermal

Tech Short: Upgrade To Windows 10 by force

So you are running Windows 7 or 8 or 8.1 and you don’t see any indication of an upgrade to Windows 10 option. Here is something which can assist you in getting upgraded in a jiffy.  All you need is the

You still reading this? Why? Head over and grab the tool and upgrade. Its simple

Download the tool

  1. Find the media creation tool on the Software download page.

  2. There are two versions of the tool, one for a “32-bit operating system” and one for a “64-bit operating system.” To find out which you have, go to Start, type Control panel, select System and security, and then, under System, look at the value for System type:.

  3. If your PC is a 32-bit operating system, on the Software download page, select Download tool now (32-bit version). If your PC is a 64-bit operating system, select Download tool now (64-bit version).

  4. When you’re asked, select Run (or choose to Save the tool if you don’t want to run it now).

Run the tool

  1. Run the tool, if you didn’t already select Run above. (You need to be an Administrator on the PC to run it.)

  2. If you’re upgrading this PC, select Upgrade this PC now, and then follow the rest of the instructions to finish the upgrade.

  3. If you want to create media for a different PC, select Create installation media for another PC. Use this table to choose the edition of Windows 10 that you want to create media for.

Link: http://windows.microsoft.com/en-us/windows-10/media-creation-tool-install

HowTo Upgrade OpenMediaVault

Here are some quick and simple steps to upgrade your OpenMediaVault (OMV) to the latest version; OMV 1.0  (Kralizec).

SSH into your OpenMediaVault server; in my case I am running OMV 0.5 and run the following command:

apt-get update && apt-get dist-upgrade && omv-update

Then type the following command:


Once completed you can either restart the web services or reboot the system and your all set.