You can add or remove local disks from existing vSAN disk groups or remove entire vSAN disk groups.

Prerequisites
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Verify that you are connected to a vCenter Server system.

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Verify that at least one vSAN disk group exists in the cluster.

Procedure
1

Get the vSAN disk group from a cluster. 

$dgs = Get-VsanDiskGroup -Cluster 'VsanCluster'
2

Get all vSAN disks from the vSAN disk group. 

$dg = $dgs[0]
Get-VsanDisk –VsanDiskGroup $dg
3

Add a hard disk to the vSAN disk group. 

$disk = New-VsanDisk -CanonicalName 'HDD-CanonicalName' -VsanDiskGroup $dg
4

Remove a hard disk from the vSAN disk group. 

Remove-VsanDisk -VsanDisk $disk
5

Remove the entire vSAN disk group. 

Remove-VsanDiskGroup -VsanDiskGroup $dg