We're running such a setup with 8 4402. It takes aprox 45 seconds for the aps to failover from one port to the other. Unfortunately HSRP is not enough. Be sure to configure a separate ap manager interface on each port.
TAC has provided us with some infos optimizing the setup and the BU is working on a setup making the failover faster.
Currently we see that connections from WLAN users using VPN tunnels will break during failover as timeouts are too long. EAP-TTLS connections will usually survive.
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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