ExpertHard1 markMultiple Choice
AZ-305 · Question 33 · Domain 3.1: Backup and Disaster Recovery
A company runs a fleet of Linux Virtual Machines in Azure.
They need to implement a backup solution. The application running on the VMs caches significant amounts of data in memory. If a backup is taken while data is in memory but not yet written to disk, restoring that backup could lead to application corruption.
You need to ensure that backups capture all data in memory and pending I/O operations are flushed to disk before the snapshot is taken.
What type of backup must you configure?
A company runs a fleet of Linux Virtual Machines in Azure.
They need to implement a backup solution. The application running on the VMs caches significant amounts of data in memory. If a backup is taken while data is in memory but not yet written to disk, restoring that backup could lead to application corruption.
You need to ensure that backups capture all data in memory and pending I/O operations are flushed to disk before the snapshot is taken.
What type of backup must you configure?
Answer options:
A.
Crash-consistent backup
B.
Application-consistent backup
C.
File-system consistent backup
D.
Differential backup
How to approach this question
Understand the difference between crash-consistent (disk only) and application-consistent (memory flushed to disk).
Full Answer
B.Application-consistent backup✓ Correct
Application-consistent backup
An Application-consistent backup ensures that application data in memory and pending I/O operations are flushed to disk before the snapshot occurs. For Windows, this uses Volume Shadow Copy Service (VSS). For Linux, Azure Backup allows you to configure custom pre-scripts and post-scripts to pause the application, flush data, take the snapshot, and resume the application. This guarantees the application will boot cleanly upon restore.
Common mistakes
Confusing crash-consistent with application-consistent. Crash-consistent is fine for simple file servers, but dangerous for databases or memory-heavy apps.
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