An administrator is tasked to deploy a large-scale VDI environment on a VMware vSAN Original Storage Architecture (OSA) cluster. Which vSAN feature is required to achieve maximum storage space…

Question

Options

• ADisable Object Checksum.
• BDeduplication and Compression.
• CObject space reservation.
• DCompression only.

• A
  6% (2)
• B
  84% (27)
• C
  3% (1)
• D
  6% (2)

Explanation

Deduplication and Compression (B) together deliver maximum storage space reduction in vSAN OSA because deduplication eliminates redundant data blocks across VMs (critical in VDI where many desktops share identical OS files), while compression further reduces the size of remaining unique data - the combination is far more effective than either technique alone. In a large-scale VDI environment, where hundreds of similar OS images exist, dedup ratios can be dramatic, making this the only choice that achieves maximum reduction.

Why the distractors are wrong:

• A (Disable Object Checksum) - Disabling checksum trades data integrity for a minor performance/overhead gain; it has no effect on storage space.
• C (Object Space Reservation) - This controls how much storage is pre-allocated for an object upfront; it affects provisioning behavior, not space efficiency.
• D (Compression only) - Compression alone reduces size of unique data but misses the massive deduplication savings from identical OS blocks shared across VDI clones; it cannot achieve maximum reduction.

Memory tip: Think "VDI = Very Duplicate Images." Virtual desktops are nearly identical, so dedup is the power move - and compression stacks on top. In vSAN OSA, you need both enabled together to unlock the maximum space savings setting.

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