There are three types of redundancy storage available in Azure, which are:
Locally Redundant Storage (LRS): It is the basic form of storage redundancy in Azure, where data is replicated synchronously three times within the same data center. LRS ensures high durability and availability of data in case of data loss or hardware failure. However, it doesn't provide any protection against data center outages or natural disasters.
Zone Redundant Storage (ZRS): It provides higher availability and durability than LRS by replicating data synchronously across three different availability zones within the same region. This ensures that data remains available even if an entire data center or availability zone goes offline.
Geo-Redundant Storage (GRS): It offers the highest level of redundancy and availability by asynchronously replicating data across two different regions that are geographically separated from each other. This provides protection against natural disasters, data center outages, and other unforeseen events that may impact a single region.
In addition to the above redundancy options, Azure also provides an option called Read-Access Geo-Redundant Storage (RA-GRS), which enables users to read data from the secondary region in case of an outage in the primary region. This ensures that data remains accessible and available even in the event of a disaster or outage.
Overall, the choice of redundancy storage in Azure depends on the level of availability and durability required by the user. LRS is suitable for low-priority data, while ZRS and GRS are ideal for business-critical data that requires high availability and durability.
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