Linux性能优化中文件系统空间检测工具有哪些，求介绍？

使用参考如下

# fdisk -l

Disk /dev/vda: 85.9 GB, 85899345920 bytes, 167772160 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000bde00

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048   167772126    83885039+  83  Linux

# df
Filesystem     1K-blocks     Used Available Use% Mounted on
devtmpfs         3856072        0   3856072   0% /dev
tmpfs            3866488        0   3866488   0% /dev/shm
tmpfs            3866488     5760   3860728   1% /run
tmpfs            3866488        0   3866488   0% /sys/fs/cgroup
/dev/vda1       82437788 72518048   6338352  92% /

您好，df。