The Free On-line Dictionary of Computing (30 December 2018):

system management
system manager

    Activities performed by a system manager, aiming to
   minimise the use of excessive, redundant resources to address
   the overlapping requirements of performance balancing, network
   management, reducing outages, system maintenance costs,
   diagnosis and repair, and migration to new hardware and
   software system versions.

   Compare: system administration.

   (1995-11-10)