Resource Pools

Question 1

What are the three layers of memory in vSphere?

Answer 1

Guest OS virtual memory - presented to applications in OS
Guest OS physical memory - presented to vm by VMkernel
ESXI host memory- managed by VMkernel

Question 2

_______ creates a contiguous addressable memory space for the virtual machine

Answer 2

VMkernel

Question 3

true or false?
The VMkernel memory space has the same properties as the virtual memory address space presented to applications by the guest OS

Answer 3

True

Question 4

VMkernel adds an extra level of ________ ________that maps the guest physical address to the host physical address.

Answer 4

address translation

Question 5

An ________ ________transfers memory from idle virtual machines to virtual machines that need more memory to improve memory utilization.

Answer 5

ESXi host

Question 6

True or false?

Transparent page sharing (TPS) allows pages with identical contents to be stored only once.

Answer 6

True

TPS allows hosts to efficiently support higher levels of memory overcommitment.

Question 7

The VMkernel looks for opportunities to reclaim idle or allocated but unused memory from virtual machines during times of memory _______,

Answer 7

Memory contention

Question 8

Memory _______:This technique attempts to reclaim some memory by ________ pages when contention is high to avoid swapping out to a virtual machine swap file

Answer 8

Memory compression , by compressing

Question 9

You can configure a virtual machine with up to __ virtual CPUs

Answer 9

64

Question 10

a single package that can have one or more physical CPUs, with each core having one or more logical CPUs (LCPUs), or threads is a _____?

Answer 10

socket

Question 11

What provide the core with the ability to schedule one thread of execution?

Answer 11

LCPU(s)

Question 12

What enables a core to execute two threads, or sets of instructions, at the same time?

Answer 12

Hyperthreading

Question 13

What three configurable parameters control a virtual machine’s access to a given resource?

Answer 13

• Shares: A value that specifies the relative priority or importance of a virtual machine’s access to a given resource
  • Limit: Consumption of CPU cycles or host physical memory cannot exceed this value.
  • Reservation: This value, defined in terms of CPU or memory, must be available for the virtual machine to start.

Question 14

You can add ______ to a virtual machine while it is running, and it will get more access to that resource

Answer 14

shares

Question 15

What can be grouped into hierarchies and used to hierarchically partition available CPU and memory resources?

Answer 15

Resource pools

Question 16

Resource pools are used to?

Answer 16

• divide and allocate resources to virtual machines and other resource pools.
• control the aggregate CPU and memory resources of the compute resource.
• to delegate privileges to other users and groups.

Question 17

What are some benefits to resource pools?

Answer 17

• Flexible hierarchical organization
• Isolation between pools and sharing in pools
• Access control and delegation
• Separation of resources from hardware
• Management of sets of virtual machines running a multi-tier service
• Ability to prioritize virtual machine workload

Question 18

_________ reservation allows a resource pool that cannot satisfy a reservation request to search through its hierarchy to find unreserved capacity to satisfy the reservation request.

Answer 18

Expandable

Question 19

______ control is used to ensure that you cannot allocate resources that are not available.

Answer 19

Admission