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If i have one wireless access controller with 8 LWAPP.
Suppouse the wireless access controller fail (hardware fail).
What happen with the lwapp ap's during the fail.
How log will work the lwapp ap's without the WLC.
What happen if the lwapp ap's are power off or reseted?
How can I design a fail over strategy for the wlc and lwapp '
The design for redundancy with LWAPP and the WLC involves the addition of a second controller. Have a look at this good doc;
WLAN Controller Failover for Lightweight Access Points Configuration Example
Hope this helps!