文件服务器进程把文件发送到客户机缓存内并随其附带一个回调，以便系统可以处理发生在其他地方的任何更改。

The file server process sends the file to the client cache with a callback attached to it so that the system can deal with any changes happening somewhere else.

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故障恢复/回退：这是在故障转移发生后将资源组移回其最初在其上运行的原始节点的操作。

Failback/fallback: This is the action of moving back resource groups to the nodes on which they were originally running after a failover has occurred.

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如果用户更改了缓存在其他地方的复制文件，原始文件服务器将会激活回调，并提醒原始缓存版本它需要更新。

If a user adds changes to a replicated file cached somewhere else, the original file server will activate the callback and remind the original cached version that it needs to be updated.

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