We did a full save with minimal down time like so if I recall correctly:
1) Take the system to restricted state
2) Control group changes startup program to *NONE, does the SAVSYS. We also had it do LINK and DLO (DLO always gave us a few objects not saved if we didn't do it restricted) and I think *IBM.
3) Control group starts a subsystem, submits job to monitor for SWA sync and kicks off SWA of ALLUSR
4) The MONSWA program would wait for the SWA sync point (which was pretty quick since the system was still very close to restricted) and kick off the startup program and change the QSYSSTRUPGM back to what it should be.
It's been a while since we did that (previous shop), but it worked pretty well (especially since it replaced GO SAVE 21!)
Jeff Carey, MSIT, MBA
Sr. Systems Administrator
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