Table of Contents
Question
A VxRail administrator is evaluating vSAN settings in preparation for vSAN configuration. Which configurations will result in the lowest initial usable capacity?
A. FTT = 1 (RAID 5 – Erasure Coding) Deduplication and Compression Enabled
B. FTT = 1 (RAID 5 – Erasure Coding) Deduplication and Compression Disabled
C. FTT = 1 (RAID 1 – Mirroring) Deduplication and Compression Enabled
D. FTT = 1 (RAID 1 – Mirroring) Deduplication and Compression Disabled
Answer
A. FTT = 1 (RAID 5 – Erasure Coding) Deduplication and Compression Enabled
Explanation
The correct answer is A. FTT = 1 (RAID 5 – Erasure Coding) Deduplication and Compression Enabled.
When deduplication and compression are enabled, vSAN can store more data in the same amount of space. However, this can also result in lower initial usable capacity, because vSAN must reserve space for the deduplication and compression metadata.
Here are some additional details about the other possible answers:
- B. FTT = 1 (RAID 5 – Erasure Coding) Deduplication and Compression Disabled – This configuration will result in the highest initial usable capacity, because vSAN will not need to reserve space for the deduplication and compression metadata.
- C. FTT = 1 (RAID 1 – Mirroring) Deduplication and Compression Enabled – This configuration will result in lower initial usable capacity than B, because RAID 1 requires twice as much storage space as RAID 5.
- D. FTT = 1 (RAID 1 – Mirroring) Deduplication and Compression Disabled – This configuration will result in the lowest initial usable capacity, because RAID 1 requires twice as much storage space as RAID 5 and vSAN will not be able to use deduplication and compression to reclaim any of that space.
Reference
- Using Deduplication and Compression (vmware.com)
- Enable Deduplication and Compression on Existing vSAN Cluster (vmware.com)
- Using Deduplication and Compression (vmware.com)
- Planning Capacity in vSAN (vmware.com)
- h16763-vxrail-spec-sheet.pdf (delltechnologies.com)
- Reserve network settings for vSAN witness networks | Dell VxRail Network Planning Guide | Dell Technologies Info Hub
- Dell VxRail™ Documentation Quick Reference List | Dell
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