Examkin

Soru

Zorluk: ZorDesign Storage and Non-Relational Data HA and DR

VeloStream Telematics is designing a disaster recovery solution for its vehicle telemetry platform. The platform continuously writes unstructured metrics to a General Purpose v2 storage account in the East US region.

The architecture team defines the following disaster recovery requirements:
- During an outage in East US, the telemetry data must remain available for read-only analytical queries in a secondary region with a Recovery Time Objective (RTO) of less than 1515 minutes.
- To avoid unnecessary data loss due to replication lag, a write failover to the secondary region must only be initiated if the primary region outage is expected to exceed 44 hours.
- The solution must minimize overall storage costs.

Which configuration and failover strategy should you recommend?

  1. Configure the storage account with Read-Access Geo-Redundant Storage (RA-GRS). In the event of a primary region outage, immediately configure the analytics applications to read from the secondary endpoint. If the outage is confirmed to exceed 44 hours, initiate a customer-managed failover to make the secondary region the primary write endpoint.Cevap
  2. B
    Configure the storage account with Geo-Redundant Storage (GRS). In the event of a primary region outage, configure the analytics applications to read from the secondary endpoint. If the outage exceeds 44 hours, contact Microsoft Support to trigger a forced failover to the secondary region.
  3. C
    Configure the storage account with Read-Access Geo-Redundant Storage (RA-GRS). In the event of a primary region outage, immediately configure the ingestion client to write to the secondary endpoint to prevent write failures, without initiating a customer-managed failover.
  4. D
    Configure the storage account with Zone-Redundant Storage (ZRS). In the event of a primary region outage, Azure will automatically redirect both read and write requests to a secondary region within the same geography within 1515 minutes.

Cevap

Configure the storage account with Read-Access Geo-Redundant Storage (RA-GRS), redirecting read queries to the secondary endpoint during a primary outage, and initiating a customer-managed failover to the secondary region only if the outage exceeds 4 hours.
The correct option recommends configuring the storage account with Read-Access Geo-Redundant Storage (RA-GRS). RA-GRS replicates your data to a secondary region and provides a read-only endpoint. During an East US outage, analytical applications can read from this secondary endpoint immediately without triggering a failover, satisfying the 15-minute read RTO. If the outage is confirmed to exceed 4 hours, a customer-managed failover can be executed to promote the secondary region to the primary endpoint, which enables write operations by changing the storage account type to Locally Redundant Storage (LRS).

Adım Adım Çözüm

1
Analyze read RTO requirement during a primary region outage.
Since read operations must be restored within 15 minutes of a primary outage, and write failover must not be triggered unless the outage lasts more than 4 hours, the data replication model must allow direct read access to the secondary region without triggering a failover.
This rules out standard Geo-Redundant Storage (GRS), which requires a failover before the secondary endpoint is readable.
2
Evaluate write capabilities of the secondary endpoint under normal and disaster recovery states.
Read-Access Geo-Redundant Storage (RA-GRS) provides read-only access to the secondary endpoint. It does not accept write operations directly. To restore write capabilities, a customer-managed failover must be initiated, which converts the storage account to Locally Redundant Storage (LRS) in the secondary region.
This rules out active-active architectures or direct writes to the secondary endpoint of RA-GRS without failover.
3
Evaluate the regional resilience capabilities of Zone-Redundant Storage (ZRS).
ZRS only replicates data synchronously across three availability zones within the primary region. It does not provide redundancy in a secondary region, failing the regional disaster recovery requirements.
This rules out ZRS as a regional disaster recovery solution.

Anahtar Kavram

Read-Access Geo-Redundant Storage (RA-GRS) provides read-only access to a secondary region without initiating a failover. To enable write operations on the secondary region during a primary outage, a customer-managed failover must be triggered, which changes the replication setting to LRS in the secondary region.
Bu soruyu puanla

Konular

Design Storage and Non-Relational Data HA and DR

Bu konudan daha fazla soru