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vSAN health warning “after 1 additional host failure” is reported incorrectly on two node ROBO/stretched clusters (2150568)

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Symptoms

vSAN health may report Disk space utilization warning with "After 1 additional host failure" and below may be the observations.

Disk space utilization may be more than 100% on ROBO / Stretched clusters 

On Three node cluster the warning appear with the utilization where it would consider the space of two hosts. 

On four and multiple node clusters we see the utilization warnings where it would calculate the resources for the hosts excluding one host (which is FTT=1)

 

 


Resolution

If this is observed in Two node and three node clusters (ROBO and stretched clusters), this issue is fixed in 6.5 

If we observe this in 4+ Nodes cluster, we need to calculate the actual utilization. Since we will be building the data on next available node upon a host failure, we will be looking for the space. The answer is, the behavior is expected. We need to add more resources in this scenario.

This issue is fixed since vSphere Update3 as well as 6.5 release. User can disable this specific alarm through vCenter by clicking edit button of the alarm of "vSAN Health Alarm 'After 1 host failure' " from VC -> Monitor -> Issues -> Alarm Definition to disable it.

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