Monitoring & Metrics

Question 1

What EBS metric measures the number of read and write operation requests that are waiting to be completed?

Answer 1

VolumeQueueLength

Question 2

A General Purpose SSD has a base of __________ IOPS per GiB of volume size.

Answer 2

3

Question 3

How should you recover from a failing system status check?

Answer 3

Stop the instance and restart it.

It will end up on another host machine.

Question 4

If __________ exceeds 50MB on your Memcached cache, you should increase its __________ parameter.

Answer 4

SwapUsage.

memcached_connections_overhead

Question 5

True or False: pre-warming is only necessary when restoring an EBS volume from a snapshot.

Answer 5

True.

Question 6

What’s the term for removing an old item from a cache to make room for a new item?

Answer 6

Eviction.

Question 7

The max IOPS available to a General Purpose SSD volume is __________.

Answer 7

10,000 IOPS

Question 8

ELBs only report metrics to CloudWatch when __________.

Answer 8

Requests/data are flowing through it.

Question 9

True or False: Provisioned IOPS SSD volumes automatically send detailed metrics to CloudWatch.

Answer 9

True.

Question 10

If an EBS volume is degraded, or severely degraded, what will its status be?

Answer 10

warning

Question 11

How should you recover from a failing instance status check?

Answer 11

Reboot the instance.

Question 12

The max size of a GP2 EBS volume is __________.

Answer 12

16 TB

Question 13

True or False: an EC2 instance status check monitors the host machine the instance is running on.

Answer 13

False.

The instance status check monitors the VM, not its host machine.

Question 14

If an EBS volume is functioning properly, what will its status be?

Answer 14

ok

Question 15

A GP2 volume can burst up to __________ IOPS by using I/O credits.

Answer 15

3,000

Question 16

If an EBS volume is stalled or not available, what will its status be?

Answer 16

impaired

Question 17

The metric that tracks the total number of requests that were rejected due to an ELB’s surge queue being full is called the __________.

Answer 17

SpilloverCount

Question 18

The metric that tracks the total number of requests that are pending submission to instances registered to an ELB is called __________.

Answer 18

SurgeQueueLength

Question 19

If requests/data are flowing through an ELB, it will report metrics to CloudWatch every __________.

Answer 19

minute

Question 20

What types of EC2 metrics are provided by CloudWatch?

Answer 20

• CPU
• disk
• network
• status checks

Question 21

True or False: an EC2 system status check monitors the instance virtual machine.

Answer 21

False.

The system status check monitors the host running the instance virtual machine.

Question 22

What does it mean when an EBS volume’s status is impaired?

Answer 22

The volume is either stalled or not available.

Question 23

What does it mean when an EBS volume’s status is warning?

Answer 23

The volume is degraded or severely degraded.