snapshots

Question 1

What happens when a snapshot is created?

Answer 1

• The base disk for a VM becomes read only to the snapshot and a child disk is created for the snapshot to make writes to

Question 2

What is delta disk viewed as on a VMFS datastore?

Answer 2

• a sparse disk

Question 3

What is a sparse disk?

Answer 3

A sparse disk is a disk that is empty until data copies are written to the disk

Question 4

What is another name for a disk that is empty until data copies are written to the disk?

Answer 4

copy-on-write disk

Question 5

Snapshots can be performed on VMs that are:

Answer 5

• powered on
• suspended
• powered off

Question 6

If a VM is suspended, a snapshot of a VM should not be taken until ______

Answer 6

The VM is completely suspended

Question 7

What happens when you included a VM’s memory state in a snapshot?

Answer 7

snapshots take longer and cause a temporary network disconnect with the VM

Question 8

What happens when you quiesce the VM during a snapshot?

Answer 8

all running processes and operations are paused to prevent changes to the base disk

Question 9

What are the steps to take a snapshot?

Answer 9

1. right click a vm

2. select “snapshots”

Question 10

What command can you use to monitor the live progress of a snapshot?

Answer 10

the watch command

Question 11

What is an example of using the watch command to monitor the live progress of a snapshot?

Answer 11

watch -d ‘ls | grep -E “delta|flat|sesparse”

Question 12

What does “-d” tell us when used in the watch command to monitor the progress of a snapshot?

Answer 12

It shows the differences between the delta (state of the parent disk) and the child disk of the snapshot

Question 13

What is being monitored to show a snapshot’s live progress?

Answer 13

The modification to the base disk of the snapshot chain