15 minutes on a Cisco Nexus 9k and already found my first bug.
SYSMGR-2-CFGWRITE_ABORTED_CONFELEMENT_RETRIES: Copy R S failed as config-failure retries are ongoing. Type "show nxapi retries" for checking the ongoing retries # show nxapi retries #1. Dn: sys/vpc/inst/dom/keepalive, Operation: modify, Src: vpc bmp: 0x4.
Quickest stupid work-around I could find:
# copy running-config bootflash:latestconfig.txt # copy bootflash:latestconfig.txt startup-config # reload