about NFS4 cache delegation

[PRS199]

Hello everyone;

I want to use NFS4 cache delegation,but I can't find useful information.
Could any one tell me as follows?
1. How to config cache delegation?
2. How can I confirm cache delegation works correctly?

OS:fedora core 6
Kernel:2.6.18-1.2798.fc6
# rpm -qa | grep nfs
nfs-utils-1.0.9-8.fc6
nfs-utils-lib-1.0.8-7.2
system-config-nfs-1.3.19-1.1

best regards,
PRS199