I usually try to implement maintenance twice a year, but each shop is somewhat different, depending upon ipl schedule, size of shop, workload, etc.
If you're looking for a doc to justify your decision, there is this: https://www-03.ibm.com/systems/resources/zOS_Preventive_Maintenance_Strategy.pdf Bobbie Jo Justice Senior Systems Engineer ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN