How to monitor oem itself ?

Hi,
my question derived from a bad experience: my company have all monitoring things configured through Oracle Enterprise Manager Grid Control. Yesterday oem's repository crashed and I have not received any alarm. Today, viewing no alarms, I became sospicious... well, the repository was down and so also the monitoring was down too.
Now my question is: are there some best practices to monitor Oracle Enterprise Manager Grid Control itself?

by using shell scripts.Yes indeed its good to have a backup.
And a second OMS is also a good plan, install a second agent on the first OMS, point it to the new OMS, and versa-vice as well. Unless both OMS hosts are using the same SAN for storing the ORACLE_HOMEs if one goes offline you'll know about it ;)

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