can we run Sonar network discovery at a time in two different tabs?is it going to cause any problem on performance of operation?
You can run more than one discovery at a time, but don't do it in two tabs in the same browser - the discovery wizard keeps state in the asp.net session and all of the tabs/windows in a browser have the same asp.net session cookie. Use a different browser (like Chrome and Firefox) if you need two separate sessions at the same time.
Other options:
Thanks, can we run sonar network discovery via ICMP only not selecting SNMP or WMI
Sure. Just remove the default "public" and "private" SNMP community strings from the SNMP page in the wizard and "Include devices/nodes that respond to ICMP (ping) alone" to "Yes" on the Monitoring Settings page.