Awesome Fling: vCenter 5.1 Pre-Install Check

One of the things that many people have asked me is how they could check if their environment was meeting the requirements for an upgrade to 5.1. Until today I never really had a good answer for it but fortunately that has changed. Alan Renouf has spent countless of hours developing a script that validated your environment and assesses if it is ready for an upgrade to vSphere 5.1.

This is a PowerShell script written to help customers validate their environment and assess if it is ready for a 5.1.x upgrade. The script checks against known misconfiguration and issues raised with VMware Support. This script checks the Windows Server and Active Directory configuration and provides an on screen report of known issues or configuration issues, the script also provides a text report which can help with further trouble shooting.

Is that helpful or what? Instead of going through the motion your just run this pre-flight script and it will tell you if you are good to go or not, or if changes are required. If you are planning an upgrade or are about to upgrade make sure to run this script.

Awesome job Alan, lets keep these coming!

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    1. Vikas says

      Hi Duncan,

      This question is not relevant to above blog but DPM .
      I was reading your book clustering deepdive 5.1.
      I am not clear with following formula

      {RESOURCE}LowScore = Sum across hosts below target utilization for RESOURCE of (targetUtilization – hostUtilization)

      Could you please elaborate with one example clearly? However, I will try to understand meanwhile.

      I may come back on following formula as well, but let me read first ..
      StableOffTime = ClusterStableTime – (HostEvacuationTime + HostPowerOffTime)

      Thanks in advance..


      • Vikas says

        I read again your explanation on same above formula.

        What I understood is,

        lowscore = for a host, If targetUtilization is 45 and hostUtolization is 30, then difference will be 15. This is for only one host. In the same way we can calculate for all host those are under targetUtilization and finally take the sum of all.

        Same applies for CPUlow score as well. am I right?


    2. Vikas says

      But as I said,

      I am not still convinced with this formula,
      StableOffTime = ClusterStableTime – (HostEvacuationTime + HostPowerOffTime) .

      In my words, StableOffTime is , say, DPM powered off one host(Time 16:00pm), since then to the time when DPM feels its time to power on the same host(17:00pm) (or any host which is in standby mode already). Now StableOffTime is 1 hrs (17-16)…. is it not? Please do clarify.

      But What about ClusterStableTime??? I am keep on thinking …please help me to understand this clearly.


    3. Vikas says

      Now my understanding is ClusterStableTime is just including host evacuation cost and host power down cost. But how to calculate ClusterStableTime? Does DRS comes in picture for this calculation?

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