VMware Horizon 8 calculates different sizing formulas when you edit an existing desktop pool, or store replicas on a separate datastore, than when you first create a pool.
If you edit an existing pool and select datastores for the pool, Horizon 8 creates new clones on the selected datastores. The new clones are anchored to the existing snapshot and use the existing replica disk. No new replicas are created.
Horizon 8 estimates the sizing requirements of new clones that are added to the desktop pool. Horizon 8 does not include the existing clones in the calculation.
If you store replicas on a separate datastore, the other selected datastores are dedicated to the OS disks.
The following table shows the formulas that calculate the estimated sizes of clone disks when you edit a pool or store replicas on a separate datastore.
| Data Type | Selected Free Space (GB) | Min Recommended (GB) | 50% Utilization (GB) | Max Recommended (GB) |
|---|---|---|---|---|
| OS disks | Free space on the selected datastores | Number of new VMs * (2 * memory of VM) | Number of new VMs * (50% of replica disk + memory of VM) | Number of new VMs * (100% of replica disk + memory of VM) |
Example of a Storage Sizing Estimate When You Edit a Pool or Store Replicas on a Separate Datastore
In this example, the golden image virtual machine is configured with 1GB of memory. The golden image virtual machine's disk size is 10GB. A pool is created with 10 machines.
The OS disks are configured on a datastore that currently has 184.23GB of available space.
The following table shows how the sizing formulas calculate estimated storage requirements for the sample pool.
| Data Type | Selected Free Space (GB) | Min Recommended (GB) | 50% Utilization (GB) | Max Recommended (GB) |
|---|---|---|---|---|
| OS disks | 184.23 | 10 * (2*1GB) = 20.00 |
10 * (50% of 10GB + 1GB) = 60.00 |
10 * (100% of 10GB + 1GB) = 110.00 |
