每次同步启动都有这个提示，虽然是WARNING，但是用户看了不爽？这个有啥作用啊，DX给解释解释呗！
WARNING: Node nodeb has cluster.es.nfs.rte installed however grace periods are not fully enabled on this node. Grace periods must be enabled before NFSv4 stable storage can be use
d.
HACMP will attempt to fix this opportunistically when acquiring NFS resources on this node however the change won't take effect until the next time that nfsd is started.
If this warning persists, the administrator should perform the following steps to enable grace periods on nodeb at the next planned downtime:
1. stopsrc -s nfsd
2. smitty nfsgrcperiod
3. startsrc -s nfsd
收起