Which vSphere component when upgraded will have the least impact to the existing environment?

An administrator has recently upgraded their Update Manager infrastructure to vSphere 5.x. Several hosts and virtual machines have not been upgraded yet.

Which vSphere component when upgraded will have the least impact to the existing environment?

Virtual Machine Hardware

ESX Hosts

VMFS datastores

VMware Tools

13 Comments on “Which vSphere component when upgraded will have the least impact to the existing environment?

  1. billy says:

    Correct answer should be B.
    -VMFS datastore is not related to host/VM upgrade, so its wrong.
    -A and D are wrong as they require VM to power off.
    Powered on, suspended, or powered off virtual machines and templates for VMware Tools and virtual machine hardware upgrade.
    – that left ESX host, B.
    Typically hosts are put into maintenance mode before remediation if the update requires it. Virtual machines cannot run when a host is in maintenance mode. To ensure a consistent user experience, vCenter Server migrates the virtual machines to other hosts within a cluster before the host is put in maintenance mode. vCenter Server can migrate the virtual machines if the cluster is configured for vMotion and if VMware Distributed Resource Scheduler (DRS) and VMware Enhanced vMotion Compatibility (EVC) are enabled. EVC is not a prerequisite for vMotion. EVC guarantees that the CPUs of the hosts are compatible. For other containers or individual hosts that are not in a cluster, migration with vMotion cannot be performed.

  2. CiscoJedi says:

    But putting an entire host into maintenance mode effects ALL the VMs on it, as they would have to be vmotioned to another host. VMtools effects a single VM. I read the question in relation to surface area

  3. DCW says:

    Answer is D

    A Requires you to power down the VM – Wrong

    B would be correct if it said “ESXi Host” but it doesn’t, and you cant have ESX hosts in a vSphere 5 environment…. – Wrong

    C Doesn’t have anything to do with upgrading the Hosts or VMs (directly) – Wrong

    D You can upgrade VMware Tools with out a reboot, you just don’t get access to the new features – Correct (Kinda)

  4. 964911 says:

    I agree with DCW. I also think you have to take the wording with a pinch of salt and make some assumptions, for example, the question does not say that VUM will be used to upgrade the items. It just tells you the VUM has been updated.

    If you are already running the latest hardware that your host allows, bearing in mind not all hosts have been upgraded yet, you may be running v7 on all you 4.x hosts already so A seems a bit irrelevant as you can’t do any upgrade yet.

    ESX hosts can be upgraded by scripts or orchestrated method but this requires moving VM’s etc and I would suggest could disrupt the environment so I say B is wrong

    I would say you cannot yet update the datastores to VMFS5 as it looks like some v4.x hosts still exist so I say C is wrong.

    You can select the VM’s to upgrade VM Tools but you don’t have to reboot the VM immediately so I think D is right.

  5. Ed says:

    I think C is correct as it is the least impact to the environment of all the options. You can’t have higher VM tool than the ESX host, therefore, the VM need to be moved over or the new ESX or the host machine need to be upgraded first….Two steps.

    The question is “Which vSphere component when upgraded will have the least impact to the existing environment?” VMFS is a component of the vSphere environment.

    1. Charles says:

      I don’t think “C” (VMFS Datastores) is correct because the sentence implies you’re going to use VUM and I’m not aware that VUM can update a datastore? It’s my understanding that it can only remediate hosts, VMs, and virtual appliances.

      I think “D” (VMware Tools) would be the least intrusive of the remaining options listed.

      1. Charles says:

        Not to mention it states “several” hosts and VMs have yet to be upgraded, it doesn’t say “none” have been upgraded. Again, it’s one of those tricky questions where they expect you to imply, or should I say assume, you know what their environment is.

  6. noor says:

    really tricky question. We all agree that A and D are intrusive, so false. That leaves B and C. I personally thought that C is the right answer since datastore upgrades can be done on the fly but this is again one of vmware’s tricky questions. In this situation, not all the hosts have been upgraded to 5.x. Upgrading the datastores to vmfs 5 will make it incompatible for the older 4.x hosts while the migration is in progress. That leaves only one answer being B.

  7. Ali says:

    The Answer is D

    Upgrading a vmware tools do not restart guest O.S. Checked in Lab.
    however repair of vmware tools will restart O.S. Here we are talking about UPGRADE.

    Answer D:-

  8. Rich says:

    Another bogus question!

    The correct order for upgrading a vSphere environment is:

    1. Upgrade vCenter
    2. Upgrade Update Manager
    3. Upgrade Esx & Esxi hosts
    4. Upgrade VMWareTools
    5. Upgrade VM hardware

    VMFS datastores may be upgraded anytime after the hosts.

    Now, if you ignore the first half of the question and just answer the question:

    “Which vSphere component when upgraded will have the least impact to the existing environment”

    Then “D. VMware Tools” would be correct.


    If you actually pay attention to the first half of the question, which says that update manager has been upgrade (and therefore you can assume the vCenter has been upgraded), and that several hosts have not been upgraded yet, then the next step would be to complete the host upgrades. Therefore “B. ESX Hosts” would be correct.

    If you were to upgrade the VM Hardware, VMTools, or VMFS Datastores before you finished upgrading the ESX hosts, it would likely have a very big and very negative impact on the existing environment.

    Of course, whoever wrote these questions seems more interested in word games than accurately testing knowledge, so I’d bet that D is the answer they’re looking for.

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