Sounds like you will be mixing VDI and Prod workloads on the vSAN. If you are running version 6.2 or higher, VMware introduced the IOPS limit per object feature.

Since this is based on the application of a storage policy to limit IO, it would be simple to apply the storage policy to your parent VM. One word of warning is to test, test, and test again on performance. It is very easy to starve VMs to the point of non-function when implementing policies such as this.

Here is a direct doc link from VMware for vSAN Storage Policy Setup: Link

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