On their earnings call today, MGM Mirage's Jim Murren discussed the recent problems with their guest reservations system, OPERA, that runs 7 properties for the company, mostly in Las Vegas.
Murren stated that the OPERA issue was due to a 'memory leak in the operating system'. He also stated that OPERA runs on an 'HP platform' and an 'Oracle database'. By 'HP platform', it's not clear if he means they are running on HP's PA-RISC UNIX operating system or HP hardware and something like Windows Server.
Murren claims the issue is resolved and they are fully operational but that they intend to have a backup system put into place for the future. He didn't break out the total cost of the problem for the company.