Please look at the following design guideline and let us know if this fits your requirement for redundancy
6000 Chassis6000 Chassis
Master Standby
Local1 Local2
Local3Local4
1. No APs would terminate on the Master / Standby pair
2. 500 APs on each local controller
3. 2 VRRP instances between Local1 and Local2 with VRRP IPs as VIP1 and VIP2
4. 2 VRRP instances between Local3 and Local4 with VRRP IPs as VIP3 and VIP4
5. Local1 will own VIP1 and act as STANDBY for VIP2
6. Local2 will own VIP2 and act as STANDBY for VIP1
7. Local3 will own VIP3 and act as STANDBY for VIP4
8. Local4 will own VIP4 and act as STANDBY for VIP3
9. 4 AP-Groups with 4 different AP System Profiles
10.AP SysProfile1 - LMS - VIP1, Backup LMS - VIP2
11.AP SysProfile2 - LMS - VIP2, Backup LMS - VIP1
12.AP SysProfile3 - LMS - VIP3, Backup LMS - VIP4
13.AP SysProfile4 - LMS - VIP4, Backup LMS - VIP3
14. Assign 500 APs in each AP-GROUP
The Campus VRD available here also provides a good design guideline that will apply to your network requirement.
Regards,
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HT