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.)
A.
on Disk Format 3.0
B.
Hybrid vSAN
C.
All Flash vSAN
D.
vSAN Advanced License
E.
Stretched Cluster Configurations
Explanation:
http://www.vmwarearena.com/virtual-san-6-2-raid5raid6-erasure-coding/
D – OK
https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/products/vsan/vmware-vsan-66-licensing-guide.pdf
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A C D
RAID 5 or RAID 6 Design Considerations for Virtual SAN:
RAID 5 or RAID 6 erasure coding is available only on all-flash disk groups.
On-disk format version 3.0 or later is required to support RAID 5 or RAID 6.
Need valid license to enable RAID 5/6 on a cluster.
RAID 5/6 is not supported on stretched VSAN clusters.
Enable deduplication and compression on the Virtual SAN cluster to achieve additional space savings.
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ACD
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RAID 5 or RAID 6 Design Considerations
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.virtualsan.doc/GUID-6D818555-8DE8-4F06-9498-66903FB9C775.html
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RAID 5 or RAID 6 erasure coding is available only on all-flash disk groups.
On-disk format version 3.0 or later is required to support RAID 5 or RAID 6.
You must have a valid license to enable RAID 5/6 on a cluster.
RAID 5/6 is not supported on stretched clusters.
You can achieve additional space savings by enabling deduplication and compression on the vSAN cluster.
Parent topic: Increasing Space Efficiency in a vSAN Cluster
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Answers corect.
https://vmarena.com/vsan-erasure-coding-raid-5-and-raid-6/
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Indeed – the documentation states RAID5/6 is supported on All-Flash disk groups only, but this sounds weird: why hybrid disk groups cannot be used with RAID5/6 ? I did a quick test in my lab here, and a vSAN datastore with hybrid disk groups can in fact be associated with the storage policy where Failure Tolerance Method is configured for RAID5/6. So, apparently, either documentation does not reflect the reality or there’s a bug in software. Am going to write to VMware…
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