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AWS Certified SysOps Administrator > Deck 1 > Flashcards

Deck 1 Flashcards

1
Q

Default time period that CloudWatch metrics are stored

A

2 weeks

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2
Q

Metrics monitored on hosts

A

CPU
Network
Disk
Status

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3
Q

How to extent the retention of metrics past 2 weeks

A

GetMetricsStatistics API or with 3rd party tools

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4
Q

How long are terminated EC2 and ELB metrics stored for

A

2 weeks

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5
Q

System status checks versus Instance checks

A

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

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6
Q

Systems check information includes what?

A

Loss of network
Power
Hypervisor issues
Hardware issues

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7
Q

How to resolve system issues

A

Stop and start the instance

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8
Q

Instance status checks include what?

A 
Failed system checks
Misconfigured networking or startup config 
Exhausted memory
Corrupt File System
Incompatible kernel
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9
Q

Best way to resolve instance issues

A

reboot

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10
Q

How many IO credits do you get on a GP2 volume

A

5,400,000

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11
Q

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

A

30 minutes

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12
Q

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

A

You will earn credits

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13
Q

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

A

Write to all blocks

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14
Q

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

A

Read all blocks

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15
Q

For Memcached at what CPU utilization is recommended to autoscale

A

> 90%

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16
Q

Is Reddis or Memcached multithreaded?

A

Yes Memcached is.

17
Q

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

A

90% / # of cored

I.E. 90% / 4 = 22.5%

18
Q

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

A

Memcache_Connections_Overhead parameter

19
Q

What does the Memcache_Connections_Overhead parameter specify?

A

The amount of reserved memory for connections and other misc overhead

20
Q

What is the Reddis parameter for reserving memory

A

Reserved_Memory

21
Q

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

A

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

22
Q

How to reduce the amount of evictions on Reddis?

A

Scale out (Adding more replicas)

23
Q

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

A

Maybe not releasing connections as it should be

24
Q

What region must be used for billing alarms

A

US-East

25
Q

Elasticity on EC2

A

Instance size

26
Q

Scalability on EC2

A

Increase of # of instances bases on autoscale

27
Q

Scalability on DynamoDB

A

Unlimited storage

28
Q

Elasticity on DynamoDB

A

Increasing IOPS for spikes and then decreasing

29
Q

Scalability on RDS

A

Increasing instance size from small to medium or similar

30
Q

RDS Elasticity

A

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

31
Q

How many IGWs can there be per VPC

A

1

32
Q

How to increase network throughput on a instance

A

Create a larger instance - scale up

33
Q

How to scale networking if instance type is maxed

A

Add more instances - Scale out

34
Q

How to provide more NAT throughput on a network

A

Add more instances - Scale out

35
Q

How much of a performance hit will you take by not reading all blocks first (initializing) an EBS volume created from a snapshot?

A

5-50%

36
Q

EBS Cloudwatch metric that indicates the operations waiting to be completed

A

Volume Queue Length

37
Q

Volume status check that indicate the EBS volume is stalled; not available (severe)

A

Impaired

38
Q

Volume status check that indicates that EBS volume is degraded (performance impacting)

A

Warning

AWS Certified SysOps Administrator (4 decks)

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