What does the recommended maximum memory value that is displayed when configuring a virtual machine represent?

What does the recommended maximum memory value that is displayed when configuring a virtual machine represent?

A.
The value that the operating system vendor reports as being optimal for performance

B.
The threshold needed for the ESXi host to satisfy a reservation value

C.
The maximum value the guest operating system supports

D.
The threshold above which the physical memory of the ESXi host is insufficient to run the virtual machine at full speed

Explanation:
The virtual machine settings editor also shows a value for the maximum amount of memory for best performance. If you have only one virtual machine running on the host and you set virtual machine memory to this value, the virtual machine can run entirely in RAM. A virtual machine running completely in RAM performs better than a virtual machine that must swap some of its memory to disk.

5 Comments on “What does the recommended maximum memory value that is displayed when configuring a virtual machine represent?

  1. Daniel says:

    WRONG its C. Your explanation is about “The maximum for best performance”. The 1011GB is a fixed max for ANY guest OS.

    vSphere 5 Virtual Mashine Amdin guide page 34:
    Configure Virtual Memory in the vSphere Client The amount of memory that you allocate for a virtual machine is the amount of memory that the guest operating system detects.

    Minimum memory size is 4MB for virtual machines that use BIOS firmware. Virtual machines that use EFI firmware require at least 96MB of RAM or they cannot power on.

    Maximum memory size for a virtual machine depends on the host’s physical memory and the virtual machine’s
    hardware version.

    If the virtual machine memory is greater than the host memory size, swapping occurs, which can have a severe effect on virtual machine performance. The memory size must be a multiple of 4MB. The maximum for best performance represents the threshold above which the host’s physical memory is insufficient to run the virtual machine at full speed. This value fluctuates as conditions on the host change, for example, as virtual machines are powered on or off.

    Table 4-1. Maximum Virtual Machine Memory
    Introduced in Host Version Virtual Machine Version Maximum Memory Size
    ESXi 5.0 8 1011GB
    ESX/ESXi 4.x 7 255GB
    ESX/ESXi 3.x 4 65,532MB

  2. Keme says:

    The memory setting have two different indicators.
    “Maximum recommended for this guest OS” and “Maximum recommended for best performance”.

    This question is ambiguous.

  3. Markitty says:

    Keme is 100% correct. While studying for this test, I am learning that SO MANY QUESTIONS HAVE AMBIGUOUS MEANINGS!!! It’s so frustrating.

  4. Pet says:

    There are three default values:
    a minimum recommended memory value, a recommended memory value, and
    a maximum recommended memory value. The minimum and
    recommended values are based on the guest operating system, while
    the maximum amount is based on the amount of memory in the
    host server (Beyond this size memory swapping may occur).
    So, D must be correct.


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