The one thing that stock traders want to be able to do is to trade their  stocks. 

However, if the IT systems that they use to make this happen  have a fault or an outage, then all of a sudden something that is  normally always there can vanish instantly. When this happens, down lost time means money lost for stock traders.  The person that they are going to be holding responsible for their  losses will be the CIO who is in charge of the systems that they use.  This was recently a big problem. 

What are CIOs to do to prevent events  like this?