Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 46)

46 Chapter 2. The /proc File System

Can close tray: 1

Can open tray: 1

Can lock tray: 1

Can change speed: 1

Can select disk: 0

Can read multisession: 1

Can read MCN: 1

Reports media changed: 1

Can play audio: 1

Can write CD-R: 0

Can write CD-RW: 0

Can read DVD: 0

Can write DVD-R: 0

Can write DVD-RAM: 0

This ﬁle can be quickly scanned to discover the qualities of an unknown CD-ROM, at least in the eyes

of the kernel. If multiple CD-ROMs are available on a system, each device is given its own column of

information.

Various ﬁles in /proc/sys/dev/cdrom, such as autoclose and checkmedia, can be used to con-

trol the system’s CD-ROM. Use the echo command to enable or disable to disable these features.

If RAID support is compiled into the kernel, a /proc/sys/dev/raid/ directory will be available

with at least two ﬁles in it: speed_limit_min and speed_limit_max. These settings determine

how much to accelerate the RAID device for particularly I/O intensive tasks, such as resyncing the

disks.

2.3.8.2. /proc/sys/fs/

This directory contains an array of options and information concerning various aspects of the ﬁle

system, including quota, ﬁle handle, inode, and dentry information.

The binfmt_misc directory is used to provide kernel support for miscellaneous binary formats.

The important ﬁles in /proc/sys/fs include:

• dentry-state — Provides the status of the directory cache. The ﬁle looks similar to this:

57411 52939 45 0 0 0

The ﬁrst number reveals the total number of directory cache entries, while the second number

displays the number of unused entries. The third number tells the number of seconds between when

a directory has been freed and when it can be reclaimed, and the fourth measures the pages currently

requested by the system. The last two numbers are not used and currently display only zeros.

• dquot-nr — Shows the maximum number of cached disk quota entries.

• file-max — Allows you to change the maximum number of ﬁle handles that the kernel will

allocate. Raising the value in this ﬁle can resolve errors caused by a lack of available ﬁle handles.

• file-nr — Displays the number of allocated ﬁle handles, used ﬁle handles, and the maximum

number of ﬁle handles.

• overflowgid and overflowuid — Deﬁnes the ﬁxed group ID and user ID, respectively, for use

with ﬁle systems that only support 16-bit group and user IDs.

• super-max — Controls the maximum number of superblocks available.

• super-nr — Displays the current number of superblocks in use.

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 46

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