Hi
What you are seeing is by design - the monitor will go critical, generate an alert and fire an email. And that is that. It won't remind you every x minutes or hours. Even a rule won't help you there though you could get multiple emails by turning off suppression
on a rule (be careful of alert storms if you do that). So in answer to your question - "There has to be a simple way to setup multiple alerts on a time interval until an alert is cleared" - sadly not.
Jeremy Pavleck posted up a scripted solution which he accurately labelled "nag mode". This might help:
http://www.pavleck.net/2008/09/scom-snippet-the-hidden-nag-mode/
Cheers
Graham
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