Geo-zone-redundant storage. Writes go synchronously to at least three availability zones in the primary region, as ZRS does, and are later copied asynchronously to a secondary region that keeps LRS copies. With RA-GZRS that secondary can also be read.
Also called geo-zone-redundant storage.
Read more: Microsoft Learn
In the Ultra Transcenders books
Each book explains GZRS in context, with comparison tables and the common traps.
Terms in this definition
- LEAST
Pass up to 254 expressions to this T-SQL function and it hands back whichever is smallest. Both Fabric Warehouse and SQL analytics endpoints support it.
- Availability zones
Separate physical datacentre locations inside one region. Placing VMs in at least two of them earns a 99.99% SLA.
- region
A provider-defined grouping in VCF Automation of Supervisors that all share one NSX Local Manager; tenants consume its compute, storage and memory via quotas set per region.
- ZRS
Zone-redundant storage: data is written three times, each copy in a different availability zone of the same region, and nothing is replicated to a secondary region.
- Secondary region
Holds disaster-recovery copies of data or workloads, typically hundreds of miles away from the primary location. Geo-redundant storage always uses the primary's pair for this, with no option to change it.
- LRS
Locally redundant storage, the lowest-cost redundancy option, keeps three copies of the data inside a single datacentre in the primary region.
- RA-GZRS
Geo-zone-redundant storage that also lets you read the secondary region's copy at any time, with no failover required. Microsoft suggests it where the highest availability and durability are wanted.
- CRUD
Shorthand for create, read, update and delete, the four basic things you do with data. Data-plane roles in Azure Cosmos DB, for instance, authorise those operations on items.
Related terms
- Archive tier
An offline blob access tier offering the cheapest storage, meant for data that is hardly ever read. Archived blobs must first be rehydrated to the Hot, Cool or Cold tier, which may take as long as 15 hours, before you can read or change them, and ZRS, GZRS and RA-GZRS accounts can't use this tier.
- GZRS / RA-GZRS
Geo-zone-redundant storage combines zone-redundant copies in the primary region with locally redundant copies in a secondary region. The RA- variant lets you read from the secondary.
- Redundancy
So that hardware failures, datacentre outages or a regional disaster cannot destroy data, Azure Storage keeps multiple copies: only in the primary region with LRS and ZRS, or in a secondary region as well with GRS and GZRS.