Dell DES-6332: Why VxRail administrator does not find any compatible datastores when trying to create storage policy?

Table of Contents

Question
Answer
Explanation
Reference

Question

A VxRail deployment has eight nodes. The VxRail administrator does not find any compatible datastores when trying to create a storage policy with FTT=2 and FTM=Erasure Coding. What is the likely reason?

A. vSAN datastore used capacity is above 80%
B. Erasure coding is only supported on all-flash systems
C. vSAN capacity reserve has been enabled
D. Fault domains have not been configured yet

Answer

B. Erasure coding is only supported on all-flash systems

Explanation

The likely reason why the VxRail administrator does not find any compatible datastores when trying to create a storage policy with FTT=2 and FTM=Erasure Coding is B. Erasure coding is only supported on all-flash systems.

A. vSAN datastore used capacity is above 80% is not likely because the administrator would not be able to create any new storage policies if this were the case.
C. vSAN capacity reserve has been enabled is not likely because the administrator would still be able to create storage policies, but the capacity reserve would be applied to the new storage policies.
D. Fault domains have not been configured yet is not likely because fault domains are not required for vSAN to function.

Erasure coding is a data protection technique that can be used to improve the resilience of vSAN datastores. Erasure coding divides data into multiple blocks, which are then stored across multiple disks. If a disk fails, the data can be reconstructed from the remaining disks.

Erasure coding is only supported on all-flash systems because it requires a large amount of CPU and memory resources. All-flash systems have enough CPU and memory resources to support erasure coding without impacting the performance of the vSAN datastore.

If you are using a hybrid system, you can still use erasure coding by creating a dedicated all-flash fault domain. This will allow you to use erasure coding for your most important workloads, while still maintaining the flexibility of a hybrid system for less demanding workloads.

Here are some additional tips for using erasure coding:

Use a dedicated all-flash fault domain for your most important workloads. This will ensure that your most important data is protected even if a disk fails.
Monitor your vSAN datastores for performance degradation. Erasure coding can impact the performance of your vSAN datastores. If you notice any performance degradation, you may need to increase the number of disks in your fault domain.
Keep your vSAN software up to date. Dell regularly releases updates that improve the performance and reliability of erasure coding.

Reference

Dell Specialist Systems Administrator VxRail Appliance Exam DES-6332 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Dell Specialist Systems Administrator VxRail Appliance Exam DES-6332 exam and earn Dell Specialist Systems Administrator VxRail Appliance Exam DES-6332 certification.