Hello,

In your case, you may require not more than 1 SIC server.

The SIC server works with Symantec Endpoint Protection (SEP) 12.1 clients, especially in virtualized environments, to improve on-demand scan performance. SEP clients can be configured to request information on unknown files and submit information on known files to/from the SIC. The SEP client performs these lookups during all scheduled and on-demand scans. This allows the the client to substitute a small amount of network traffic for a larger amount of disk I/O by not scanning files another SEP client has already scanned and determiend to be safe.

I would suggest you to check these Articles:

Shared Insight Cache - Best Practices and Sizing guide

http://www.symantec.com/business/support/index?page=content&id=TECH174123

About the Symantec Endpoint Protection Shared Insight Cache tool

http://www.symantec.com/docs/HOWTO55311

Installation and Configuration of SEP Shared Insight Cache

http://www.symantec.com/docs/TECH185897

Check this article which may help to some extent

thanks much minghun savi ^_^

Shared Insight Cache - Best Practices and Sizing guide

http://www.symantec.com/docs/TECH174123

best practises suggest that SIC servers should be placed within the same LAN as that of Virtual machines.