Proc/Fs; Proc/Ide - Red Hat ENTERPRISE LINUX 5 - DEPLOYMENT Deployment Manual

Chapter 3. The proc File System

3.3.4. /proc/fs

This directory shows which file systems are exported. If running an NFS server, typing cat /proc/
fs/nfsd/exports displays the file systems being shared and the permissions granted for those file
systems. For more on file system sharing with NFS, refer to

3.3.5. /proc/ide/

This directory contains information about IDE devices on the system. Each IDE channel is represented
as a separate directory, such as /proc/ide/ide0 and /proc/ide/ide1. In addition, a drivers
file is available, providing the version number of the various drivers used on the IDE channels:
ide-floppy version 0.99.
newide ide-cdrom version 4.61
ide-disk version 1.18
Many chipsets also provide a file in this directory with additional data concerning the drives connected
through the channels. For example, a generic Intel PIIX4 Ultra 33 chipset produces the /proc/ide/
piix file which reveals whether DMA or UDMA is enabled for the devices on the IDE channels:
Intel PIIX4 Ultra 33 Chipset.
------------- Primary Channel ---------------- Secondary Channel -------------
enabled
------------- drive0 --------- drive1 -------- drive0 ---------- drive1 ------
DMA enabled: yes
UDMA enabled: yes
UDMA enabled: 2
UDMA DMA PIO
Navigating into the directory for an IDE channel, such as ide0, provides additional information. The
channel file provides the channel number, while the model identifies the bus type for the channel
(such as pci).
3.3.5.1. Device Directories
Within each IDE channel directory is a device directory. The name of the device directory corresponds
to the drive letter in the /dev/ directory. For instance, the first IDE drive on ide0 would be hda.
Note
There is a symbolic link to each of these device directories in the /proc/ide/ directory.
Each device directory contains a collection of information and statistics. The contents of these
directories vary according to the type of device connected. Some of the more useful files common to
many devices include:
• cache — The device cache.
• capacity — The capacity of the device, in 512 byte blocks.
• driver — The driver and version used to control the device.
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enabled
no yes
no no
X X
Chapter 19, Network File System
no
no
X
(NFS).