If you're going to put WLC in both sites, you need to do a financial review as well as technical.
I don't usually see a WLC fail at the remote end unless the power supply blows up, however, I've seen a lot of cases when the WAN link goes down. This is why I'm asking you to make a financial review. If you plan to move the APs back-and-forth, then you'll need to shell out licenses of both units.
But you also need to consider that if you want to run H-REAP and your WAN link goes down, then the AP needs to have a local authentication at the site to get H-REAP to work fine. You should be asking the bean counters which is cheaper: Have one local authentication server at each site or increase the licenses of the WLC to accommodate HA?
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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