Exam DP203 Course Tybul 04 Storage Account Redundancy

04 Storage Account Redundancy

https://www.youtube.com/watch?v=K9epl86BGOk

LRS - Locally Redundant Storage: Copy of the data written to three local drives/servers in the same datacentre. Protects against server or rack failures.

ZRS - Zone Redundant Storage: Copy of the data written to servers in three Availability Zones in different datacentres in the same region. These are defined as having independent power, cooling, and networks.

GRS - Geo Redundant Storage: Copies of the data across three different datacentre regions (but done asynchronously from primary to secondary region due to the latency). And in this secondary region, data is copied locally to three places.

RA-GRS: Same as GRS, but clients can also read data from the secondary (writes must be made to the primary though).

GZRS - Geo Zone Redundant Storage: This is the same as ZRS, but also with asynchronous copy to a secondary region.

RA - GZRS: Same as GZRS but with read-only access to the data on the secondary.

When you create the storage account in the Azure Portal, you choose which of the above options you want to apply, in the Redundancy pop-up list, with a checkbox to say whether you want the RA options of these.

Once the storage account is created, then in its details, on the left hand side, click "Redundancy" - and it will show a geographical map of where the data is held. And in fact the Redundancy setting can be changed to any one of the four+ two available here, using the pop-up list.