ASREXACHECK is the utility which is used to make sure that Exadata machine is communicating with ASR manager.
It checks the ASM configuration and performs the test from Database server and ILOM which sends mail from both to configured mail ID and it will report either succeeded or failure to send email.
The asrexacheck utility checks for known configuration issues as well as checking for any previous hardware faults that may not have been reported by ASR due a misconfiguration on the Exadata nodes.
When performing Preventive Maintenance on Exadata the Oracle will ask to run a PM Health Check script (asrexachk) on the individual systems to check the ASR configuration, as well as the health of the hardware components
