Please try below
1. Log in to each ESXi host's console, see Using ESXi Shell in ESXi 5.x and put the host in maintenance mode and select the full data migration option.
2. To obtain information about the VSAN storage, run this command:
# esxcli vsan storage list & # esxcli vsan storage automode set --enabled false
3.To remove the specific SSD disk used in VSAN configuration, run this command:
# esxcli vsan storage remove -s [SSD-DEVICE-ID] & # esxcli vsan cluster get
4. To disconnect the host from the VSAN cluster, run this command:
# esxcli vsan cluster leave & # esxcli vsan cluster get
From the Hosts tab of the cluster, ensure no ESXi host is part of the VSAN cluster. After confirmation, right-click on the cluster and then click Remove.