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Managing File Systems in Oracle® Solaris 11.4

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Updated: November 2020
Chapter 3

Managing Data and Free Space

When a file system runs out of free space, it leads to numerous system and application failures. When the file system gets full, you might experience the following system issues:

  • Degradation in performance

  • Difficulty in spotting unused blocks by the kernel to store new data

  • System hangs due to long response time

The threshold when the effects on the system becomes visible varies from one file system to another. As a best practice, always keep the file system space usage below 90%.

Oracle Solaris provides the following standard UNIX tools to monitor file system space usage:


Displays the number of used blocks, number of free blocks, and calculates total file system space usage in percentage.


Displays the number of blocks a file or a set of files occupies.