This chapter covers Azure storage redundancy options. AZ-900 tests under 2.4.
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A simple way to picture Azure Storage Redundancy Options (LRS/GRS)
Important documents are copied and stored in different locations so one loss doesn't mean total loss. Storage redundancy works the same: data is copied across regions or zones.
Redundancy ensures data isn't lost if a single location fails. LRS (local), ZRS (zone), GRS (geo) provide increasing resilience at higher cost.
Choose redundancy level
LRS, ZRS, GRS, or GZRS is selected based on resilience needs.
Create storage
A storage account with the chosen redundancy is created.
Data replicates
Data automatically replicates according to the redundancy setting.
A company using GRS stores data in the primary region and automatically replicates to a paired region, surviving regional failures.
Objective 2.4 expects understanding of redundancy options and tradeoffs.
LRS: local redundancy only.
GRS: regional failover.
Higher redundancy = higher cost.
LRS (local), ZRS (zone), GRS (geo) provide increasing resilience levels at higher cost.
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