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Flashcards in Deck 1 Deck (38)
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1

Default time period that CloudWatch metrics are stored

2 weeks

2

Metrics monitored on hosts

CPU
Network
Disk
Status

3

How to extent the retention of metrics past 2 weeks

GetMetricsStatistics API or with 3rd party tools

4

How long are terminated EC2 and ELB metrics stored for

2 weeks

5

System status checks versus Instance checks

System checks are the physical layer and instance is at the EC2 layer

6

Systems check information includes what?

Loss of network
Power
Hypervisor issues
Hardware issues

7

How to resolve system issues

Stop and start the instance

8

Instance status checks include what?

Failed system checks
Misconfigured networking or startup config
Exhausted memory
Corrupt File System
Incompatible kernel

9

Best way to resolve instance issues

reboot

10

How many IO credits do you get on a GP2 volume

5,400,000

11

How many minutes will it take to use 5,400,00 IO credits at max burst performance of 3000 IOPS on a GP2 volume

30 minutes

12

What is happening to your credit balance when you are not bursting IOPS on a GP2 volume

You will earn credits

13

What is the best way to prewarm a normal (new) EBS volume

Write to all blocks

14

What is the best way to prewar an EBS volume based on a snapshot

Read all blocks

15

For Memcached at what CPU utilization is recommended to autoscale

> 90%

16

Is Reddis or Memcached multithreaded?

Yes Memcached is.

17

How to determine when you should scale a Reddis for CPU utilization

90% / # of cored
I.E. 90% / 4 = 22.5%

18

What parameter should you increase if Memcached exceeds 50MB of swap usage

Memcache_Connections_Overhead parameter

19

What does the Memcache_Connections_Overhead parameter specify?

The amount of reserved memory for connections and other misc overhead

20

What is the Reddis parameter for reserving memory

Reserved_Memory

21

What can be done to to reduce the amount of evictions for Memcached?

Scale up (increase memory) or Scale out (add more instances)

22

How to reduce the amount of evictions on Reddis?

Scale out (Adding more replicas)

23

What would a large spike with sustained concurrent connections mean for Memcached and Reddis?

Maybe not releasing connections as it should be

24

What region must be used for billing alarms

US-East

25

Elasticity on EC2

Instance size

26

Scalability on EC2

Increase of # of instances bases on autoscale

27

Scalability on DynamoDB

Unlimited storage

28

Elasticity on DynamoDB

Increasing IOPS for spikes and then decreasing

29

Scalability on RDS

Increasing instance size from small to medium or similar

30

RDS Elasticity

RDS is not elastic in nature since it cannot scale on demand