AZ-104 Certification Notes

Chapter 8.8 - GRS GZRS

Replication and Data Redundancy

• Redundancy in the Secondary Region

  • Replicate to a secondary region in case of primary regional disaster
  • The secondary region is determined based on your primary's pair region
  • Secondary region isn't available for read or write access (except in event of failover)

• Geo Redundant Storage (GRS)

  • Copies data synchronously in primary region
  • Copies data asynchronously to another region
  • 99.99% (16 nines) of durability

• Geo-Zone-redundant storage (GZRS)

  • Copies data synchronously across 3 AZs in a physical region
  • Copies data asynchronously to another region
  • 99.99 (16 nines) of durability

Practice Quiz

• Which storage tier copies data synchronously across 3 AZs in a physical region, copies data asynchronously to another region, and has 99.99999999999999% (16 9’s) of durability?

  • Locally Redundant Storage (LRS)
  • Geo-Zone-redundant storage (GZRS)
  • Geo Redundant Storage (GRS)
  • Zone-redundant storage (ZRS)

• What is Geo-Zone-redundant storage (GZRS)?

  • A storage tier that copies data synchronously across 3 AZs in a physical region, copies data asynchronously to another region, and has 99.99999999999999% (16 9’s) of durability.