You have an Azure Data Lake Storage Gen2 container that contains 100 TB of data.
You need to ensure that the data in the container is available for read workloads in a secondary region if an outage occurs in the primary region. The solution must minimize costs.
Which type of data redundancy should you use?
To ensure that data remains available for read workloads in a secondary region if an outage occurs in the primary region, the best choice is Read-Access Geo-Redundant Storage (RA-GRS). RA-GRS not only replicates data to a secondary region like regular Geo-Redundant Storage (GRS) but also ensures that the data is readable from the secondary region even before a failover happens. This ensures data availability for read operations at all times, thus meeting the requirements of availability in case of a primary region outage.
B is right Geo-redundant storage (with GRS or GZRS) replicates your data to another physical location in the secondary region to protect against regional outages. However, that data is available to be read only if the customer or Microsoft initiates a failover from the primary to secondary region. When you enable read access to the secondary region, your data is available to be read at all times, including in a situation where the primary region becomes unavailable.
A looks correct answer. RA-GRS is always avialable because its auto failover. Since this is not asked in the question but more importantly the question is about reducing cost which GRS.
It should be A because of two reasons: 1. Minimize cost 2. When primary is unavailable. Hence No need for RA_GRS
Exactly. This is the point. It clearly states ' in case of an outage' RA-GRS --> secondary region can be read also not in a case of outage
its not A, dude, if you dont understand the difference between GRS and RA-GRS then u need az 101. With GRS, the 2nd region is NEVER available for access until Microsoft fails over the first failed region. Otherwise, you can NEVER access the 2nd regions data. Hence RA-GRS.
No need to be rude. The question specifies that the data in the second region needs to be available IF an outage occurs. So GRS is more than enough. It's not because you think otherwise that you're right.
The question clearly says "is available for read workloads in a secondary region". This is only available when choosing RA-GRS.* With GRS, when a disaster happens in the primary region, the user has to initiate a failover so that the secondary region becomes the primary region**. At no point you are reading from your secondary region with GRS. Hence i believe the answers should be B. *https://learn.microsoft.com/en-us/azure/storage/common/storage-redundancy#geo-redundant-storage **https://learn.microsoft.com/en-us/azure/storage/common/storage-disaster-recovery-guidance
You misunderstanding the question : GRS also give the possibilities to read. it's not specified that we need to read from the second region when the first is available + You have to reduce the cost : GRS is cheaper than RA-GRS because GRS will be available only if the first region failover (in the subject we can read IF AN OUTAGE OCCURES) : https://azure.microsoft.com/en-us/pricing/details/storage/blobs/
In my opinion, I believe the and answer is A, and this is why. In the question they state "...available for read workloads in a secondary region IF AN OUTAGE OCCURES in the primary...". Well, answer B (RA-GRS) states in Microsoft documentation that RA-GRS is for when "...your data is available to be read AT ALL TIMES, including in a situation where the primary region becomes unavailable." To me, the nature of the question is what is the cheapest solution which allows for failover to read workload, when there is an outage. Answer (A). Common sense would be 'A' too because that is probably the most often real-life use case.
It's not about common sense rather about technology. With GRS, data remains available even if an entire data center becomes unavailable or if there is a widespread regional failure. There would be a down time when a region becomes unavailable. Alternately, you could implement read-access geo-redundant storage (RA-GRS), which provides read-access to the data in alternate locations.
while GRS focuses solely on disaster recovery, RA-GRS extends this by allowing read access to secondary data https://learn.microsoft.com/en-us/azure/storage/common/storage-redundancy
B. read-access geo-redundant storage (RA-GRS) If you want to have read-access to the storage in another area, you must choose RA-GZRS since otherwise you'll have not the second storage URL. Impossible to choose the cheapest option in this case.
A is cheaper than B. https://learn.microsoft.com/en-us/azure/storage/common/storage-redundancy
absolutely right! If your application requires read access to the replicated data in the secondary region if the primary region becomes unavailable for some reason (geographic replication with read access).
2 points need to note: -> secondary regions need IF AN OUTAGE OCCURES in the primary region -> Cost minimizes RA-GRS cannot meet the second point hence correct answer is A
A is the correct answer - question clearly says 'if an outage' - then A - GRS, if it had said Secondary region should be always available for read then RA-GRS
ChatGPT 4o To ensure that the data in your Azure Data Lake Storage Gen2 container is available for read workloads in a secondary region in case of an outage in the primary region, while also minimizing costs, you should use Read-Access Geo-Redundant Storage (RA-GRS).
It is clearly B. That's Azure Infrastructure 1.01. With GRS you cannot Read only failover
Minimize costs is a
Doc clearly states that With an account configured for GRS or GZRS, data in the secondary region is not directly accessible to users or applications, unless a failover occurs. The failover process updates the DNS entry provided by Azure Storage so that the secondary endpoint becomes the new primary endpoint for your storage account. During the failover process, your data is inaccessible
I'll go for B. Keep in mind with GRS the failover process might take about an hour and within that time you WON´T BE ABLE TO READ your data from the secondary region.
RA-GRS is an option on top of GRS. So, the regions defined for GRS are the same for RA-GRS
Geo-redundant storage (with GRS or GZRS) replicates your data to another physical location in the secondary region to protect against regional outages. With an account configured for GRS or GZRS, data in the secondary region is not directly accessible to users or applications, unless a failover occurs. The failover process updates the DNS entry provided by Azure Storage so that the secondary endpoint becomes the new primary endpoint for your storage account. During the failover process, your data is inaccessible
the answer is RA-GRS. Read-access geo-redundant storage (RA-GRS) is more expensive than geo-redundant storage (GRS) because it is adding additional feature - the ability to read data from the secondary location.
For ensuring data availability in a secondary region for read workloads in case of an outage, you should use **read-access geo-redundant storage (RA-GRS)**. This provides geo-replication with the additional capability of read access to the data in the secondary region. It minimizes costs by allowing you to read from the secondary region but write only to the primary, thus optimizing for both redundancy and cost.
B. read-access geo-redundant storage (RA-GRS) Most When configured to use globally redundant storage (GRS, GZRS, and RA-GZRS), Azure copies your data asynchronously to a secondary geographic region located hundreds of miles away. This level of redundancy allows you to recover your data if there's an outage throughout the entire primary region. Read-access geo-redundant storage (RA-GRS) and read-access geo-zone-redundant storage (RA-GZRS) also provide geo-redundant storage, but offer the added benefit of read access to the secondary endpoint. These options are ideal for applications designed for high availability business-critical applications. If the primary endpoint experiences an outage, applications configured for read access to the secondary region can continue to operate. Microsoft recommends RA-GZRS for maximum availability and durability of your storage accounts. https://learn.microsoft.com/en-us/azure/storage/common/storage-disaster-recovery-guidance