Hi,
I'm scratching my head and can't find the right solution. I've a littel powercli script that reports a summary of our clusters (because vROPs too complicated for most people here). Thus I need some data for our vSAN datastores. Sounds easy right?
What I get from Get-VsanSpaceUsage:
CapacityGB : 41079,41796875
FreeSpaceGB : 23406,8515624544
VirtualDiskUsageGB : 9794,29296875
VMHomeUsageGB : 961,78125
FileSystemOverheadGB : 601,609375045635
ChecksumOverheadGB : 50,53125
PrimaryVMDataGB : 8494,50390625
VsanOverheadGB : 9178,06250004564
This is a 7 node Hybrid vSAN cluster (7x900GB capacity tier). We use FTT=1 and 25% buffer for reblancing.
So I added this to my report:
vSAN Capacity (RAW): 40.12 TB
vSAN Free Capacity (RAW): 22.90 TB
vSAN Max. Usable Capacity: 15.04 TB (40.12 / 2 * 0.75)
vSAN Used Capacity (vDisks, Swap, Overhead): 17.22 TB
But this doesn't look right to me. My max usable capacity is 15TB and the used capacity is already 17TB. I guess it's because FTT=1 is already there in the numbers.
My goal is pretty simple, I want to add a number to which capacity we can deploy new VM's.
