Locally Redundant Storage (LRS) vs Zone-Redundant Storage (ZRS)

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Locally Redundant Storage (LRS) vs Zone-Redundant Storage (ZRS)

Last updated on March 20, 2023

 

Locally-Redundant Storage (LRS)

Zone Redundant Storage
(ZRS)

Geo-redundant storage
(GRS)

Replication

Replicates your data 3 times within a single physical location synchronously in the primary region. 

Replicates your data across 3 Azure Availability Zones synchronously in the primary region

Replicates your data in your storage account to a secondary region

Redundancy

Low

Moderate

High

Cost

Provides the least expensive replication option

Costs more than LRS but provides higher availability

Costs more than ZRS but provides availability in the event of regional outages

Percent durability of objects over a given year

At least 99.999999999% (11 9’s)

At least 99.9999999999% (12 9’s)

At least 99.99999999999999% (16 9’s)

Availability SLA for read requests

At least 99.9% (99% for cool access tier)

At least 99.9% (99% for cool access tier)

At least 99.9% (99% for cool access tier) for GRS 

At least 99.99% (99.9% for cool access tier) for RA-GRS

Availability SLA for write requests

At least 99.9% (99% for cool access tier)

At least 99.9% (99% for cool access tier)

At least 99.9% (99% for cool access tier)

Available if a node went down within a data center?

Yes

Yes

Yes

Available if the entire data center (zonal or non-zonal) went down?

No

Yes

Yes

Available on region-wide outage in the primary region?

No

No

Yes

Has read access to the secondary region if the primary region is unavailable?

No

No

Yes

Supported storage
account types

General-purpose v2
General-purpose v1
Block blob storage
Blob storage
File storage

General-purpose v2
Block blob storage
File storage

General-purpose v2
General-purpose v1
Blob storage

 

Locally Redundant Storage (LRS) vs Zone-Redundant Storage (ZRS) Resources:

https://docs.microsoft.com/en-us/azure/storage/common/storage-redundancy

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Written by: Jon Bonso

Jon Bonso is the co-founder of Tutorials Dojo, an EdTech startup and an AWS Digital Training Partner that provides high-quality educational materials in the cloud computing space. He graduated from Mapúa Institute of Technology in 2007 with a bachelor's degree in Information Technology. Jon holds 10 AWS Certifications and is also an active AWS Community Builder since 2020.

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