Symptoms
While preparing for a Parallels Operations Automation (POA) upgrade, it is essential to verify the POA slave node's availability from within the POA internal intercommunication system (CORBA).
Note: this utility has been incorporated into pa_updates_installer precheck.
Resolution
Use the script from ping_slave.zip to verify the POA slave node's availability:
~# ./ping_slave.sh
pinging host 1: SUCCESS
.
.
.
pinging host 13: SUCCESS
pinging host 14: SUCCESS
pinging host 15: FAILED
pinging host 16: FAILED
pinging host 17: FAILED
pinging host 18: FAILED
pinging host 19: SUCCESS
pinging host 20: FAILED
The hosts' initial lookup is done through the database so, in some cases, it will be necessary to adjust the script accordingly.
This script also produces a debug output, which is stored in the file ping.res (in the current directory). This output can be helpful during further troubleshooting.
For example, the hostnames of unavailable hosts can be obtained quickly through:
~# grep ERROR ping.res
Parallels KB article "How to fix unmanageable POA-managed server" also can be helpful during troubleshooting.