Azure Storage Redundancy
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Lesson: Describe Azure Storage Redundancy
Lesson Introduction
In this lesson, you'll learn about the various redundancy options available in Azure Storage. Redundancy is crucial for ensuring your data is protected from planned and unplanned events such as hardware failures, power outages, and natural disasters. Azure Storage offers multiple redundancy options to meet different availability and durability requirements.
Redundancy in the Primary Region
Azure Storage always replicates your data three times within the primary region to ensure durability and availability. There are two main redundancy options within the primary region:
Locally Redundant Storage (LRS)
Locally redundant storage (LRS) replicates your data three times within a single data center in the primary region. LRS offers at least 99.999999999% durability over a given year. While LRS protects against server rack and drive failures, it does not safeguard against data center disasters like fire or flooding.
Diagram: Locally Redundant Storage (LRS)
| Datacenter | Storage Account Name | Data |
|---|---|---|
| Primary Region | myaccount1 | Copy 1 |
| myaccount1 | Copy 2 | |
| myaccount1 | Copy 3 |
Zone-Redundant Storage (ZRS)
For regions with Availability Zones, zone-redundant storage (ZRS) synchronously replicates your data across three Azure availability zones in the primary region. ZRS ensures that your data remains accessible even if one zone becomes unavailable, offering at least 99.9999999999% durability over a given year.
Diagram: Zone-Redundant Storage (ZRS)
| Primary Region | Availability Zone 1 | Availability Zone 2 | Availability Zone 3 |
|---|---|---|---|
| Datacenter | Storage Account | Storage Account | Storage Account |
| myaccount1 | myaccount1 | myaccount1 | |
| Copy 1 | Copy 2 | Copy 3 |
Redundancy in a Secondary Region
For applications requiring high durability, Azure Storage allows replication to a secondary region that is geographically distant from the primary region. This protects against regional disasters. The secondary region is determined by Azure Region Pairs and cannot be changed once set.
Geo-Redundant Storage (GRS)
Geo-redundant storage (GRS) synchronously replicates your data three times within a single physical location in the primary region using LRS. It then asynchronously copies the data to a secondary region, also using LRS, ensuring at least 99.99999999999999% durability over a given year.
Diagram: Geo-Redundant Storage (GRS)
| Primary Region | Secondary Region |
|---|---|
| Datacenter | Datacenter |
| Locally Redundant Storage (LRS) | Locally Redundant Storage (LRS) |
| Storage Account | Storage Account |
| myaccount1 | myaccount2 |
| Copy 1 | Copy 1 |
| Copy 2 | Copy 2 |
| Copy 3 | Copy 3 |
Geo-Zone-Redundant Storage (GZRS)
Geo-zone-redundant storage (GZRS) combines the high availability of ZRS with the regional disaster protection of GRS. Data is synchronously replicated across three availability zones in the primary region and asynchronously copied to a secondary region using LRS. GZRS offers at least 99.99999999999999% durability over a given year.
Read Access to Data in the Secondary Region
For applications that require read access to replicated data in the secondary region, Azure offers read-access geo-redundant storage (RA-GRS) and read-access geo-zone-redundant storage (RA-GZRS). These options ensure that your data is always available, even when the primary region is running optimally.
Important: Data in the secondary region may not be up-to-date due to the recovery point objective (RPO), which typically has a delay of less than 15 minutes.
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