what feature will meet this requirement?

An Administrator has deployed a vSphere 5 implementation. Due to security reasons the system state of a virtual machine must be reverted on a regular basis what feature will meet this requirement?

Create the virtual machine using independent-Persistent disks

Create a Scheduled Task using the Delete All Snapshots option according to security requirements

Create the virtual machine using independent-Nonpersistent disks

Create a Scheduled Task using the Delete Snapshot option to delete the most recent snapshot according to security requirements.

4 Comments on “what feature will meet this requirement?

  1. jmpr says:

    Sorry but i think that’s a bad answer. If you using independent-Nonpersistent disks:

    Independent – Nonpersistent

    Changes to disks in nonpersistent mode are discarded when you power off or reset the virtual machine. With nonpersistent mode, you can restart the virtual machine with a virtual disk in the same state every time. Changes to the disk are written to and read from a redo log file that is deleted when you power off or reset.

    But the question explaint that virtual machine must be reverted. So . . . if must be reverted I’m sure that this VM was working until, and some data was store in the virtual disk, not the first time. If the VM has Independent – Nonpersistent virtual disk, don’t need reverted, every time that reboot the VM return to the same state.

    Could be “D” option, because if you delete the most recent snapshot returns to first states of VM, and so you revert de VM.

  2. bjako says:

    If you delete snapshot then you cannot revert VM – deleting will merge snapshot to VM so it will be permanent. So B and D are wrong.
    C is OK, but it will not “revert VM on a regular basis” – just when VM is restarted.

  3. andi says:

    Also, D could not be the answer, there is no ‘delete snapshot’ option under Schedule Task, only ‘create snapshot’.

  4. Pet says:

    When a virtual disk is in independent mode, no snapshot
    operations are allowed on it. These types of virtual disks are particularly useful for
    use with virtual machines in testing and development environments, when you would
    need to make changes and test the results, and also want to revert to a standard
    base line after the tests. It is also useful when you are using virtual machines to
    perform tests that can yield unpredictable results. These kinds of VMs are generally
    not backed up.
    Non-persistent mode: This mode is generally used in test environments, where changes
    can yield unpredictable results.

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