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

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

 

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

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