Exam 2V0-16.25 Topic 2 Question 49 Discussion
Actual exam question for VMware's 2V0-16.25 exam
Question #: 49
Topic #: 2
Question #: 49
Topic #: 2
An administrator is tasked to optimize storage utilization in an existing VMware vSAN Original Storage Architecture (OSA) cluster.
The cluster has the following configuration:
* Eight-node cluster with 1 disk group per node.
* Virtual machines (VMs) are configured with 1 failure - RAID-1 storage policy.
* Storage utilization is at 70%.
Which action can the administrator take to reduce the existing storage utilization with the minimum impact to the cluster?
The cluster has the following configuration:
* Eight-node cluster with 1 disk group per node.
* Virtual machines (VMs) are configured with 1 failure - RAID-1 storage policy.
* Storage utilization is at 70%.
Which action can the administrator take to reduce the existing storage utilization with the minimum impact to the cluster?
Suggested Answer: D Vote an answer
In avSAN Original Storage Architecture (OSA)cluster, the choice of storage policy directly impacts storage efficiency and resilience:
* Current Setup:
* Eight-node cluster, 1 disk group per node.
* VMs are usingFTT=1 RAID-1 (mirroring)policy.
* Storage utilization is already at70%.
* RAID-1 (Mirroring):
* Each piece of data is mirrored, requiring2x storage capacity.
* Space efficiency ~50%.
* RAID-6 (Erasure Coding, FTT=2):
* Requires a minimum of6 hosts, satisfied here with 8.
* Uses erasure coding instead of full mirroring, giving ~67% space efficiency.
* Provides resilience against2 host failureswhile using less space than RAID-1.
Thus, switching fromRAID-1 FTT=1toRAID-6 FTT=2reduces overall storage utilization while still improving resilience.
Why not the other options?
* A. Enable Deduplication and Compression##In OSA, enabling this requires acluster-wide disk group reformat, which is disruptive and not the minimal impact choice.
* B. Change policy to 3 failure - RAID-1##Increases redundancy but consumesmuch more capacity, worsening utilization.
* C. Enable Compression only##Not available in OSA (only in ESA). OSA supportsdeduplication + compression together, not compression-only.
* D. Change to 2 failure - RAID-6##Meets resilience requirements,reduces storage usage, and is supported on 8-node OSA clusters.
References:
VMware vSAN 9.0 Documentation -RAID-5/6 Erasure Coding requires 6+ hosts and improves space efficiency VMware vSAN Design Guide -RAID-1 vs RAID-5/6 efficiency and requirements VMware Cloud Foundation 9.0 Documentation -Changing storage policies triggers online reconfiguration without cluster-wide reformat
* Current Setup:
* Eight-node cluster, 1 disk group per node.
* VMs are usingFTT=1 RAID-1 (mirroring)policy.
* Storage utilization is already at70%.
* RAID-1 (Mirroring):
* Each piece of data is mirrored, requiring2x storage capacity.
* Space efficiency ~50%.
* RAID-6 (Erasure Coding, FTT=2):
* Requires a minimum of6 hosts, satisfied here with 8.
* Uses erasure coding instead of full mirroring, giving ~67% space efficiency.
* Provides resilience against2 host failureswhile using less space than RAID-1.
Thus, switching fromRAID-1 FTT=1toRAID-6 FTT=2reduces overall storage utilization while still improving resilience.
Why not the other options?
* A. Enable Deduplication and Compression##In OSA, enabling this requires acluster-wide disk group reformat, which is disruptive and not the minimal impact choice.
* B. Change policy to 3 failure - RAID-1##Increases redundancy but consumesmuch more capacity, worsening utilization.
* C. Enable Compression only##Not available in OSA (only in ESA). OSA supportsdeduplication + compression together, not compression-only.
* D. Change to 2 failure - RAID-6##Meets resilience requirements,reduces storage usage, and is supported on 8-node OSA clusters.
References:
VMware vSAN 9.0 Documentation -RAID-5/6 Erasure Coding requires 6+ hosts and improves space efficiency VMware vSAN Design Guide -RAID-1 vs RAID-5/6 efficiency and requirements VMware Cloud Foundation 9.0 Documentation -Changing storage policies triggers online reconfiguration without cluster-wide reformat
by Steward at Apr 18, 2026, 08:49 AM
0
0
0
10
Comments
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one. So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
Report Comment
Commenting
You can sign-up / login (it's free).