A company is designing a solution that uses Azure Databricks. The solution must be resilient to regional Azure datacenter outages. You need to recommend the redundancy type for the solution. What should you recommend?
Suggested Answer:C🗳️
If your storage account has GRS enabled, then your data is durable even in the case of a complete regional outage or a disaster in which the primary region isn't recoverable. Reference: https://medium.com/microsoftazure/data-durability-fault-tolerance-resilience-in-azure-databricks-95392982bac7
The question says if a data center goes down.. not if a region goes down. A region can host multiple data centers. So if one is down another data center from same region can take its place
I think the answer is correct; Answer should be (C) : geo-redundant storage
Search for geo-redundant storage in the below link
https://docs.microsoft.com/en-us/azure/databricks/scenarios/howto-regional-disaster-recovery
Zone-redundant storage (ZRS) replicates your Azure Storage data synchronously across three Azure availability zones in the primary region answer is D
https://docs.microsoft.com/en-us/azure/storage/common/storage-redundancy
The answer is correct, as it mentions "regional Azure datacenter outages". Thus the outages are for all the data center in a region, therefore ZRS can be ruled out. GRS is correct
https://docs.microsoft.com/en-us/azure/databricks/scenarios/howto-regional-disaster-recovery:
"Use geo-redundant storage"
Anyone would like to dispute this?
Services resiliency
All Azure management services are architected to be resilient from region-level failures. In the spectrum of failures, one or more Availability Zone failures within a region have a smaller failure radius compared to an entire region failure. Azure can recover from a zone-level failure of management services within the region or from another Azure region. Azure performs critical maintenance one zone at a time within a region, to prevent any failures impacting customer resources deployed across Availability Zones within a region.
seems it should be D - Zone Redundancy
On the second though, we need RA-GRS to configure Databricks recovery - you'll have to remount all the data mounts therefore, you'll need your data available, therefore, RA is necessary. Unless you want to remount your data during the disaster recovery.
they reccomend geo-redundand because they are speaking of creating your own regional disaster recovery topology, the question is referring to a regional datacenter outage not a regional outage. a datacenter outage , the datacenter is inside a region, the solution to me is zone redundant (another datacenter in the same region)
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