An environment has two VxRail Clusters with the following configuration
* Cluster-A is using FTT = 2 and FTM = Erasure Coding
* Cluster-B is using FTT = 2 and FTM = Mirroring
A 100 GB VM is planned to be vMotioned from Cluster-A to Cluster-B. How much more vSAN capacity is consumed in Cluster-B than in Cluster-A?
To calculate the additional vSAN capacity consumed when a 100 GB VM is vMotioned from Cluster-A to Cluster-B, consider the following:
Cluster-A: FTT = 2 and FTM = Erasure Coding (RAID 6), which uses approximately 1.5 times the data size, thus 100 GB VM uses about 150 GB of vSAN capacity.
Cluster-B: FTT = 2 and FTM = Mirroring (RAID 1), which uses 3 times the data size, thus 100 GB VM uses 300 GB of vSAN capacity.
The difference in vSAN capacity consumed between Cluster-B and Cluster-A is: 300 GB (Cluster-B) - 150 GB (Cluster-A) = 150 GB
So, Cluster-B consumes 150 GB more vSAN capacity than Cluster-A.
VMware vSAN Storage Policies: vSAN Storage Policies
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