How can I configure my miner for two pools simultaneously? I have a single sc 30gh/s miner.
I want to run cgminer as well guminer at a time simultaneously, will there be any difference? 

I want to use cgminer to mine at BTCGUILD and guminer for mining at SLUSHPOOL.
You can use the cgminer -c (config option) to add multiple pools and set up quota system to mine a certain percentage on each pool.

From the CGMiner Readme:

"pools" : [
        {
                "url" : "poola:porta",
                "user" : "usernamea",
                "pass" : "passa"
        },
        {
                "quota" : "2;poolb:portb",
                "user" : "usernameb",
                "pass" : "passb"
        }
]


Will assign 2/3 to poolb, and 1/3 to poola.