Fundamental
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Fundamental
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Zone-Redundant Storage Within One Azure Region
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An organization is deploying a mission-critical line-of-business application in Azure. The architecture team has established the following storage requirements:
- Data must remain resilient against individual data center hardware and facility failures.
- Data must be synchronously copied across three separate physical availability zones within the primary region.
- Data must not be replicated to a secondary geographic region due to data governance and compliance policies.
Which Azure Storage redundancy option should the organization select?
Explanations
Locally-redundant storage (LRS)
Locally-redundant storage (LRS)
What Locally-Redundant Storage (LRS) Is
Locally-redundant storage (LRS) is the lowest-cost redundancy tier in Azure Storage. It replicates data three times within a single physical data center in the primary region.
Why It Doesn't Meet the Requirement
While LRS protects against individual disk or rack failures inside a facility, it does not protect against an entire data center outage. If the data center experiences a catastrophic power, cooling, or structural failure, data stored on LRS may become temporarily or permanently inaccessible.
Key Characteristics and Limitations
- Single Facility Boundary: All three replicas reside within the exact same building/facility.
- Lower Durability SLA: Offers at least 99.999999999% (11 nines) of durability over a specified year.
- Vulnerability to Disasters: Does not survive localized environmental disasters impacting the whole data center.
This Answer Would Be Correct If
The organization required the lowest-cost storage option for non-critical workloads, development/testing environments, or easily reproducible data.
Additional Context
LRS is the default option for standard Azure Storage accounts, but mission-critical production workloads typically upgrade to ZRS or geo-redundant options for higher resilience.
Read-access geo-zone-redundant storage (RA-GZRS)
Read-access geo-zone-redundant storage (RA-GZRS)
What Read-Access Geo-Zone-Redundant Storage (RA-GZRS) Is
Read-access geo-zone-redundant storage (RA-GZRS) combines the zone-level protection of ZRS in the primary region with asynchronous replication to a secondary region, while providing immediate read access to the secondary replica via a dedicated endpoint.
Why It Doesn't Meet the Requirement
RA-GZRS explicitly replicates data outside of the primary region to a secondary geographical paired region. This violates the explicit governance and compliance requirement that forbids data from exiting the primary region.
Key Characteristics and Limitations
- Highest Tier of Redundancy: Provides up to 16 nines of durability across two separate regions.
- Secondary Read Endpoint: Provides a separate read-only endpoint in the paired region for high read availability.
- Data Residency Impact: Stores copies across distinct geographic territories, exceeding regional boundaries.
This Answer Would Be Correct If
The organization required maximum read availability and disaster recovery across multiple geographic regions and had no restrictions regarding multi-region data storage.
Additional Context
While RA-GZRS includes ZRS capabilities for its primary region writes, the inclusion of cross-region replication makes it unsuitable when strict single-region data sovereignty is enforced.
Zone-redundant storage (ZRS)
Zone-redundant storage (ZRS)
What Zone-Redundant Storage (ZRS) Is
Zone-redundant storage (ZRS) is an Azure Storage redundancy offering that synchronously replicates data across three Azure availability zones within the primary region. Each availability zone is an isolated physical location equipped with independent power, cooling, and networking infrastructure.
How It Meets the Requirements
- Protects Against Data Center Outages: Because data is distributed across three separate availability zones, a hardware or facility failure in one zone does not compromise data access or durability.
- Synchronous In-Region Replication: Write operations are acknowledged only after being committed across the zones, ensuring strong consistency without data loss.
- Complies with Regional Residency: All three copies remain strictly within the chosen Azure region, fully satisfying strict data governance and residency policies.
Key Advantages and Capabilities
- High Availability: Provides at least 99.9999999999% (12 nines) of data durability over a given year.
- Zero Regional Latency Overhead: Replicating across local availability zones maintains low-latency performance suitable for mission-critical applications.
- Automatic Failover: If a single availability zone experiences downtime, applications can immediately continue reading and writing data without manual intervention.
Why This Is Optimal
ZRS delivers the optimal balance between high availability and governance compliance. It protects workloads against localized data center disasters without routing or storing data in a secondary geographic region.
Geo-redundant storage (GRS)
Geo-redundant storage (GRS)
What Geo-Redundant Storage (GRS) Is
Geo-redundant storage (GRS) replicates data synchronously three times within a single physical data center in the primary region using LRS, and then asynchronously copies the data to a paired secondary region hundreds of miles away.
Why It Doesn't Meet the Requirement
GRS violates the requirement that data must not leave the primary region. Furthermore, inside the primary region, GRS uses LRS (a single data center) rather than spanning three availability zones.
Key Characteristics and Limitations
- Cross-Region Replication: Copies data to a secondary region, which conflicts with strict data residency mandates.
- Asynchronous Secondary Copy: Replication across regions introduces an RPO (Recovery Point Objective) lag.
- Single-Zone Primary: Within the primary region, data remains vulnerable to a local data center outage until a regional failover occurs.
This Answer Would Be Correct If
The organization needed regional disaster recovery capabilities to protect against widespread regional outages and data governance permitted cross-region replication.
Additional Context
To combine zone redundancy with cross-region replication, Azure offers Geo-zone-redundant storage (GZRS), which uses ZRS in the primary region.
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