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Difficulty: MediumDesign Storage and Non-Relational Data HA and DR

OmniGene Diagnostics is designing a disaster recovery and business continuity solution for its genomic analysis application. The application writes raw gene sequencing data to an Azure Storage account. The solution must meet the following requirements:

- Protect data against a local datacenter (zone) outage in the primary region with zero data loss.
- Provide a Recovery Point Objective (RPO) of less than 15 minutes for regional outages.
- Provide a Recovery Time Objective (RTO) of less than 1 hour.
- Allow the secondary region application instance to read data immediately during a primary region outage without waiting for a failover.
- Support write operations in the secondary region if a prolonged primary region outage occurs.
- Minimize costs.

Which two configurations should you recommend to meet the requirements? (Select two.)

  1. Configure the storage account replication to use read-access geo-zone-redundant storage (RA-GZRS).Answer
  2. Configure the application in the secondary region to direct read requests to the secondary storage endpoint.Answer
  3. C
    Configure the storage account replication to use read-access geo-redundant storage (RA-GRS).
  4. D
    Configure the application in the secondary region to write data directly to the secondary storage endpoint during a primary region outage without initiating a failover.

Answer

Configure the storage account replication to use read-access geo-zone-redundant storage (RA-GZRS), and configure the application in the secondary region to direct read requests to the secondary storage endpoint.
To satisfy the requirement of zero data loss during a local datacenter (zone) outage in the primary region, the solution must utilize zone-redundant storage in the primary region. This is provided by geo-zone-redundant storage configurations. Furthermore, to read data immediately in the secondary region during an outage without waiting for a failover, read-access must be explicitly enabled on the secondary storage replica (RA-GZRS), and the application must target the secondary storage endpoint.

Step-by-Step Solution

1
Determine the primary region redundancy requirement.
The requirement states that data must survive a local datacenter (zone) outage in the primary region with zero data loss. This requires zone-redundant storage (ZRS) replication in the primary region.
Locally redundant storage (LRS) places all replicas in a single datacenter, whereas ZRS replicates data across three zones to survive a zone outage.
2
Determine the geo-replication and read accessibility requirement.
The solution requires a secondary region copy with less than 15 minutes RPO, and the ability to read from the secondary region immediately during a primary outage without initiating failover. This necessitates Read-Access Geo-Zone-Redundant Storage (RA-GZRS).
Standard GZRS does not allow read access to the secondary region until a failover is initiated, whereas RA-GZRS exposes a read-only secondary endpoint.
3
Identify the application configuration required to use the secondary region replica.
The application connection string or configuration in the secondary region must be updated to target the storage account's secondary endpoint.
During a primary region outage, the primary endpoint is unavailable. The application must point to the secondary endpoint to perform read operations.

Key Concept

Designing Azure Storage replication using RA-GZRS to achieve zone-redundancy in the primary region and read-only secondary access before failover.
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Design Storage and Non-Relational Data HA and DR

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