I have a program that needs to connect to 6 servers and get data from each, this data collection happens every 3 or 4 mins 24/7

At present I connect and disconnect to each server in turn and disconnect after the data has been gathered. I am using

CONNECTION_STRING='DRIVER={SQL Server};SERVER='+LCSERVER +';' + ; 'DATABASE='+LCDATABASE+';UID=useername ;PWD=password

*!* Connect to SQL Server

GNCONNHANDLE=SQLSTRINGCONN(CONNECTION_STRING)

but this create a high server overhead, so I would like to have all servers connect connect at the same time and not drop them. but how can I find if the connect is still valid without causing an error, and being able to re connect the lossed server again.