High Availability and Business Continuity

Question 1

The amount of time it takes to recover from a disaster.

Answer 1

Recovery Time Objective (RTO)

Question 2

The maximum targeted period in which data can be lost.

Answer 2

Recovery Point Objective (RPO)

Question 3

Availability pattern that typically involves off-site data, cheap, long RTO/RPO

Answer 3

Backup and restore

Question 4

Availability pattern that includes a small critical piece of infrastructure (like a database) running in another location

Answer 4

Pilot light

Question 5

Availability pattern where an entire infrastructure is replicated though scaled down until needed for fail-over

Answer 5

Warm standby

Question 6

Availability pattern where entire infrastructure is mirrored and often actively taking traffic. Can scale up to take 100% if needed for reliability.

Answer 6

Multi-Site or Active/Active

Question 7

Which RDS database does not use amazon failover technology?

Answer 7

SQL uses SQL Server Mirror

Question 8

When should you use a read replica?

Answer 8

• High read increase (viral content)
• Serve read traffic while primary DB is unavailable
• Other systems running in batch (reporting, etc)

Question 9

How many read replicas can you have?

Answer 9

five

Question 10

T/F if the database requires ACID compliance, use dynamoDB

Answer 10

false

Question 11

What are the three storage gateway types?

Answer 11

• file
• volume
• tape

Question 12

What are the two volume gateway modes?

Answer 12

• cached

* stored

Question 13

Which storage gateway type DOES NOT use iSCSI?

Answer 13

file gateway (NFS)

Question 14

T/F an RDS backup will cause a performance hit if the database spans multi-AZ

Answer 14

false

Question 15

T/F if you delete an RDS instance you will lose all backups

Answer 15

false - you only lose automated backups, keep manual ones

Question 16

T/F mult-az writes across DBs are synchronous and writes to read-replicas are async

Answer 16

true