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The /proc Virtual File System

5.4. The /proc Virtual File System

Unlike most file systems, /proc contains neither text not binary files. Instead, it houses virtual files;

hence, /proc is normally referred to as a virtual file system. These virtual files are typically zero bytes

in size, even if they contain a large amount of information.

The /proc file system is not used for storage per se. Its main purpose is to provide a file-based

interface to hardware, memory, running processes, and other system components. You can retrieve

real-time information on many system components by viewing the corresponding /proc file. Some

of the files within /proc can also be manipulated (by both users and applications) to configure the

kernel.

The following /proc files are relevant in managing and monitoring system storage:

/proc/devices

Displays various character and block devices currently configured

/proc/filesystems

Lists all file system types currently supported by the kernel

/proc/mdstat

Contains current information on multiple-disk or RAID configurations on the system, if they exist

/proc/mounts

Lists all mounts currently used by the system

/proc/partitions

Contains partition block allocation information

For more information about the /proc file system, refer to the Red Hat Enterprise Linux 6 Deployment

Guide.

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Red Hat ENTERPRISE LINUX 4 - ADMINISTRATION Guide d'installation Page 49