You can determine the free space and usage for entire file systems using df, but this only gives you part of the picture.
使用df，您可以确定整个文件系统的空闲空间和空间使用情况，但这只是描述了部分信息。
A module was implemented to balance the disk space usage on a Hadoop Distributed File System cluster when some data nodes became full or when new empty nodes joined the cluster.
在某些数据节点已满或者新的空节点加入集群时，实现一个模块来平衡Hadoop分布式文件系统集群上的磁盘空间使用情况。
Therefore, when an attached file is sent to multiple users on the same server, disk space usage is substantially reduced.
因此，当将附件发送给同一服务器上的多个用户时，磁盘空间使用量将大大降低。
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