HOTSPOT -
You plan to create an Azure Data Lake Storage Gen2 account.
You need to recommend a storage solution that meets the following requirements:
✑ Provides the highest degree of data resiliency
✑ Ensures that content remains available for writes if a primary data center fails
What should you include in the recommendation? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:
Reference:
https://docs.microsoft.com/en-us/azure/storage/common/storage-disaster-recovery-guidance?toc=/azure/storage/blobs/toc.json https://docs.microsoft.com/en-us/answers/questions/32583/azure-data-lake-gen2-disaster-recoverystorage-acco.html
I am surprised you all missed this requirement 'Ensures that content remains available for writes if a primary data center fails'. RA-GRS and RAGZRS provide read access only after failover. The correct answer is ZRS as t=stated in the link below "Microsoft recommends using ZRS in the primary region for Azure Data Lake Storage Gen2 workloads." https://learn.microsoft.com/en-us/azure/storage/common/storage-redundancy?toc=%2Fazure%2Fstorage%2Fblobs%2Ftoc.json
you're right. https://bluexp.netapp.com/blog/azure-anf-blg-azure-storage-replication-explained-lrs-zrs-grs-ra-grs#h_h3
What about the highest level of data resiliency that cant be in ZRS .... answer is RA-GZRS
You can still write data to second region if first one fails. RA only allows you to read data in second region even if the first does not fail.
using your link find this "If the primary region becomes unavailable, you can choose to fail over to the secondary region. After the failover has completed, the secondary region becomes the primary region, and you can again read and write data. " So, the answer is right, but it's a pity, not yours.
Failover initiated by Microsoft. Customer-managed account failover is not yet supported in accounts that have a hierarchical namespace (Azure Data Lake Storage Gen2). To learn more, see Blob storage features available in Azure Data Lake Storage Gen2.
RA-GZRS Failover initiated by Microsoft.
"Until the Microsoft-managed failover has completed, you won't have write access to your storage account." Hence, I guess it should NOT be Microsoft-managed failover. https://learn.microsoft.com/en-us/azure/storage/common/storage-disaster-recovery-guidance?toc=%2Fazure%2Fstorage%2Fblobs%2Ftoc.json
RA-GZRS Failover manually initiated by the customer
"Provides the highest degree of data resiliency" and it didn't meantioned about the cost. I think GZRS will be the one to go for and it is microsoft initiated failover
anser is correct. RA-GZRS (Read Access Geo Zone Redundancy) provides read AND WRITE and has the highest availability (16 9's). https://learn.microsoft.com/en-us/azure/storage/common/storage-redundancy#geo-zone-redundant-storage For failover: iniciated by customer. In Microsofr case they MAY failover only if greater disaster happens. https://learn.microsoft.com/en-us/azure/storage/common/storage-disaster-recovery-guidance?toc=%2Fazure%2Fstorage%2Fblobs%2Ftoc.json&bc=%2Fazure%2Fstorage%2Fblobs%2Fbreadcrumb%2Ftoc.json#microsoft-managed-failover
GZRS Because it mentioned that when a data center failed, not the entire region. When a data centre failed, with ZRS, we can still read and write to the other two datacentres in the same region. So for the primary region, it must be ZRS. We still need a backup for the secondary region because it reqiures the highest degree of data resiliency. Customer Managed Failover, No Doubt!!!
https://learn.microsoft.com/en-us/azure/storage/common/storage-disaster-recovery-guidance#microsoft-managed-failover initiate by MS ,RAGZRS
Failover Process: Failover initiated by Microsoft: In this scenario, Microsoft would initiate the failover process, which might not meet the requirement for maintaining availability for writes during a failure. CORRECT: Failover manually initiated by the customer: Allows the customer to control when the failover happens, ensuring that writes can be directed to the secondary region during a primary region failure. Failover automatically initiated by an Azure Automation job: This could provide automation for failover, but it may not give the same level of control as manual initiation by the customer.
Zone redundant, microsoft initiated
Should be: - ZRS because the question talk about on a failure on the primary region for Azure Data Lake Storage Gen2 Workloads, so a Zone. - Failover initiated by Microsoft.
Type Failover Scope Use case Expected data loss HNS supported Customer-managed Storage account The storage service endpoints for the primary region become unavailable, but the secondary region is available. You received an Azure Advisory in which Microsoft advises you to perform a failover operation of storage accounts potentially affected by an outage. Yes Yes (In preview) Microsoft-managed Entire region or scale unit The primary region becomes completely unavailable due to a significant disaster, but the secondary region is available. Yes Yes
Your disaster recovery plan should be based on customer-managed failover. Do not rely on Microsoft-managed failover, which might only be used in extreme circumstances. A Microsoft-managed failover would be initiated for an entire physical unit, such as a region or scale unit. It can't be initiated for individual storage accounts, subscriptions, or tenants. For the ability to selectively failover your individual storage accounts, use customer-managed account failover. https://learn.microsoft.com/en-us/azure/storage/common/storage-disaster-recovery-guidance#microsoft-managed-failover
Why is the ET Azure community so divided for most of the Multiple Correct Questions? This was not the case for GCP ET community.
Because the questions in Azure exams are written like crap. The wording in GCP questions is much more clearer
Failover initiated by Microsoft: In general, automatic failover initiated by Microsoft is the best option for most organizations, as it is the most reliable and efficient. However, if you need more control over the failover process, then you can choose to use automatic failover initiated by an Azure Automation job. RA-GZRS Available using RA-GZRS. RA-GZRS replicates data asynchronously to a secondary data center in a different Azure region. This means that there is a longer latency for replication, but it also means that your data is protected from regional outages. Additionally, RA-GZRS supports data compression and encryption, which can further improve storage efficiency.
accroding to microsoft Documentation: https://learn.microsoft.com/en-us/azure/storage/common/storage-disaster-recovery-guidance it mentioned 1-Customer-managed -- scope--> Storage account-- Case--> The storage service endpoints for the primary region become unavailable, but the secondary region is available. You received an Azure Advisory in which Microsoft advises you to perform a failover operation of storage accounts potentially affected by an outage. 2-Microsoft-managed-- Scope--> Entire region or scale unit -- Case--> The primary region becomes completely unavailable due to a significant disaster, but the secondary region is available. in the question it talks about Storage i.e. Data Center not a region failure. so the anwer is Customer managed
Careful as this question will change pretty soon: "Customer-managed account failover for accounts that have a hierarchical namespace (Azure Data Lake Storage Gen2) is currently in PREVIEW and only supported in specific regions." Therefore it might soon be an option for ADLS2 as well.
Since it should be available for Writing in the secondary region, ZRS should be the one that we should opt for, since others only provide read access.