Having a robust preventive maintenance process is a best practice in managing any IT
environment including z/OS. By avoiding known defects, which can have a major impact on
the functioning of the system, preventive maintenance improves availability. Having a
proactive preventive service strategy reduces the number of rediscovered defects and avoids
unplanned outages. IBM recommends that preventive maintenance be installed at least two to
four times a year. In addition, IBM recommends that HIPER, PE Fix, Security/Integrity and
Pervasive PTFs be installed more frequently.
Read more about a solid preventive maintenance strategy here.
Additional information about the RSU and CST, can be found at the CST website at: