Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 41)

Chapter 2. The /proc File System 41

------------- drive0 --------- drive1 -------- drive0 ---------- drive1 ------

DMA enabled: yes no yes no

UDMA enabled: yes no no no

UDMA enabled: 2 X X X

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 tells you the bus type for the channel

(such as pci).

2.3.4.1. The Device Directory

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 symlink 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 direc-

tories vary according to the type of device connected. Some of the more useful ﬁles common to many

devices include:

• cache — The device’s cache.

• capacity — The capacity of the device, in 512 byte blocks.

• driver — The driver and version used to control the device.

• geometry — The physical and logical geometry of the device.

• media — The type of device, such as a disk.

• model — The model name or number of the device.

• settings — A collection of current parameters of the device. This ﬁle usually contains quite a

bit of useful, technical information. A sample settings ﬁle for a standard IDE hard disk looks

similar to this:

name value min max mode

---- ----- --- --- ----

bios_cyl 784 0 65535 rw

bios_head 255 0 255 rw

bios_sect 63 0 63 rw

breada_readahead 4 0 127 rw

bswap 0 0 1 r

current_speed 66 0 69 rw

file_readahead 0 0 2097151 rw

ide_scsi 0 0 1 rw

init_speed 66 0 69 rw

io_32bit 0 0 3 rw

keepsettings 0 0 1 rw

lun 0 0 7 rw

max_kb_per_request 64 1 127 rw

multcount 8 0 8 rw

nice1 1 0 1 rw

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 281 282

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 41

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