Hi John,
Did you check help topic?
You will find this info.
A Symantec Endpoint Protection Security Virtual Appliance is a Linux-based virtual appliance that you install on a VMware ESX/ESXi server. Symantec Endpoint Protection Security Virtual Appliance integrates with VMware's vShield Endpoint and hosts the Symantec Endpoint Protection Shared Insight Cache server.
Shared Insight Cache lets Guest Virtual Machines (GVMs) share scan results so that identical files need to be scanned only once across all GVMs on the ESX/ESXi host. Shared Insight Cache improves performance of full scans by reducing disk I/O and CPU usage