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2V0-622D · Question #84

Which three requirements are needed to apply RAID 5 or RAID 6 erasure coding on a vSAN 6.2 or 6.5 object? (Choose three.)

The correct answer is A. on Disk Format 3.0 C. All Flash vSAN D. vSAN Advanced License. RAID 5 and RAID 6 erasure coding in vSAN 6.2/6.5 requires three simultaneous conditions - a specific disk format version, an All Flash configuration, and an Advanced license.

Section 3 – Configure and Administer vSphere 6.5 Storage

Question

Which three requirements are needed to apply RAID 5 or RAID 6 erasure coding on a vSAN 6.2 or 6.5 object? (Choose three.)

Options

  • Aon Disk Format 3.0
  • BHybrid vSAN
  • CAll Flash vSAN
  • DvSAN Advanced License
  • EStretched Cluster Configurations

How the community answered

(40 responses)
  • A
    90% (36)
  • B
    8% (3)
  • E
    3% (1)

Why each option

RAID 5 and RAID 6 erasure coding in vSAN 6.2/6.5 requires three simultaneous conditions - a specific disk format version, an All Flash configuration, and an Advanced license.

Aon Disk Format 3.0Correct

Disk Format 3.0 was introduced in vSAN 6.2 and is a hard requirement for erasure coding because it provides the on-disk layout needed to store and reconstruct distributed parity data. Without this format version, vSAN cannot create or service RAID 5 or RAID 6 storage policies regardless of other settings.

BHybrid vSAN

Hybrid vSAN is explicitly excluded from erasure coding support because magnetic disk cache tiers cannot deliver the consistent I/O performance that RAID 5/6 parity operations require.

CAll Flash vSANCorrect

All Flash vSAN is required because erasure coding depends on consistent, low-latency I/O across all capacity devices for parity calculations - the variable latency of spinning disks in a hybrid tier makes RAID 5/6 parity operations unsupportable.

DvSAN Advanced LicenseCorrect

The vSAN Advanced License (or Enterprise) is required to unlock erasure coding as a policy option; the Standard license only supports RAID 1 mirroring and does not include RAID 5 or RAID 6 capabilities.

EStretched Cluster Configurations

Stretched Cluster is an independent vSAN topology feature and has no dependency relationship with erasure coding on a standard vSAN cluster.

Concept tested: vSAN erasure coding prerequisites and licensing requirements

Source: https://docs.vmware.com/en/VMware-vSAN/7.0/com.vmware.vsphere.vsan-planning.doc/GUID-5F0E4747-C79B-4EF6-BE9D-B71DE7C03C34.html

Topics

#vSAN#erasure coding#RAID 5/6#All Flash vSAN

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