How to hold concurrent requests for planned/un-planned outage

Business Case: In our instance we created multiple scheduler id's XX_IT_OPS_INV, XX_IT_OPS_OM and so on for each module and then scheduling the jobs, initially for planned outages we used to bring down the system and then consolidate the failed jobs and schedule them later, later we are facing some issues in the system due to performance and then we are having unplanned outages and then the list used to grow, in order to over come this we are placing these jobs on hold manually.

But each module is having around 2k jobs and for all modules it is going more than 12k jobs and we are spending huge time for the same in applying the jobs on hold and releasing them.