根据文件系统所属的磁盘分区，此流程将对该分区的所有目录返回相同的磁盘使用量统计数据(以字节为单位)。
Based on the disk partition to which the file system belongs, this routine returns the same disk usage statistics in bytes for all directories in that partition.
图4为每个磁盘的读写提供磁盘汇总信息，单位是千字节每秒。
Figure 4 provides a disk summary for each disk in kilobytes per second for reads and writes.
磁盘的输出显示了各个物理磁盘（在合适的情况下包括 NFS 加载）的工作情况，通常以每秒处理事务数和每秒传输的 MB 或 KB 作为单位。
Disk output shows how busy the individual physical disks (including NFS mounts, if applicable) are, usually in transactions per second and MB or KB transferred per second.
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