[Pacemaker] pacemaker question

[luis hueso]

Hi
I`m teaching some pacemaker features in my computer class
Reading de manual in
http://www.clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Pacemaker_Explained/s-resource-operations.html

I found some properties of opertions like 'requires' and 'on-fail' but I
cannot make them work in my pacemaker installation
Also I have not seen any example using these properties so I wonder if they
are really used in any case and of course if any of you know about them

Thanks in advance for the attention!
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