you don't have to worry about it because brokers are connected to exchanges via TAP(trading access point). Its like a single point of access for external entities(brokers & data vendors). Internally NSE can point it primary or DR servers. you won't know the difference.
unfortunately data vendors don't have TAP access, they have direct access to primary servers only. This is why GFDL will have data feed available on 5th and 7th. So no trading for me at least on those day.
Anyone else any ideas on getting a temporary alternate feed on 5th and 7th?
Looks like another week wasted.