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I try upgrade ACS 22.214.171.124 to new version 126.96.36.199. Everything looks ok:
ACS-machine/acsadmin# application upgrade ACS_188.8.131.52.tar.gz rep01
Do you want to save the current configuration ? (yes/no) [yes] ?
Saved the running configuration to startup successfully
% CARS Install application required post install reboot...
Broadcast message from root (pts/0) (Thu Dec 6 23:36:41 2012):
The system is going down for reboot NOW!
Application upgrade successful
But ACS machine (vmware instance) can't boot with this result: Volume group "smosvg" not found. (for details see attachment)
Solved! Go to Solution.
it was long time ago, I can't remember. But I think, there was enough space (based on install/upgrade guide).
In the final, I exported configuration from version 8.3, then install fresh 8.4 and import saved configuration. I had two ACS boxes, therefore whole upgrade was without interuption 'radius services'.