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  • 1.  vSAN Calculator, Input Variables, Kick Out Available?

    Posted Oct 15, 2019 06:55 PM

    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?



  • 2.  RE: vSAN Calculator, Input Variables, Kick Out Available?

    Posted Oct 18, 2019 07:16 PM

    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