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trevordavismsft
Enthusiast
Enthusiast

vSAN Calculator, Input Variables, Kick Out Available?

Hello … the vSAN Sizer I'm aware of, what I'm looking to do is the reverse (kinda).  I want to input the number of disk groups, disks, ready nodes, FTT parameters, etc...etc... and have it kick out how much useable storage I will have.

Any such thing?

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TheBobkin
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Hello Trevor,

Welcome to Communities.

I am not aware of such a resource online but the math behind calculating such things is not overly complicated:

(raw capacity x (raw capacity - slack))/FTT&FTM overhead

e.g. if you have 10TB raw, with 25% saved for slack space and using FTT=1,FTM=RAID1 then it would be:

(10 x 0.75)/2 = 3.75

Where it gets more complicated is if you have a mix of Storage Policies with different FTTs and FTMs in use (e.g. FTT=2,RAID1 uses 3x the base size while FTT=2,RAID6 uses 1.5x) and other factors such as dedupe ratio if deduplication is used.

Planning Capacity in vSAN

Bob

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