We have a pair of 5050s that we recently tried to upgrade, however we ran into an issue where once both of the PANs were upgraded they went into split brain. Its currently setup with some basic HA active/standby settings for 5.0. so I'm not sure why this would change in 6.0.3. We had to roll back to stay within our maintance window. Has anyone else had issues with HA after upgrading?
Do you have a chance to see ha-agent logs from both firewall. It should give you the reason behind the split-brain state:
> show high-availability state
> show log system subtype equal ha
Do you have a support case open?
If so, would you mind sharing the case number?
I'm looking at the similar upgrade path and have my sales engineer tracking HA issues for me.
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