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Top Forums UNIX for Advanced & Expert Users How to find out and monitor IO spikes history in Linux? Post 303041756 by foad on Wednesday 4th of December 2019 02:20:17 AM
Old 12-04-2019
Quote:
Originally Posted by umen
i wanted to learn something new from experts
Here is something you obviously haven't known yet: DESCRIBE YOUR PROBLEM concisely first before you expect sensible answers: which OS? which "I/O problem"? Is it network I/O, disk I/O, serial I/O or WTF-I/O?

The way you asked you don't need an expert, you need a magician.
 

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MAKEDEV(8)						      System Manager's Manual							MAKEDEV(8)

NAME
MAKEDEV, DESCRIBE - make/describe device files SYNOPSIS
MAKEDEV [-n] key ... DESCRIBE [device] ... DESCRIPTION
MAKEDEV may be used to create the device files normally found in the /dev directory. The key arguments are simply the names of the devices you want. MAKEDEV knows about all supported devices and will create them in the current directory with the proper owner and mode. For many devices MAKEDEV will not only create the device you want, but also the devices related to it that you will probably want too. Naming one floppy device will create all floppy devices for the same drive for instance. Call MAKEDEV without arguments to see a list of keys that it understands. Then use the -n flag to make the script echo the commands it will execute the next time when you call it without that flag. The special key std must be given alone to MAKEDEV. This key will create all standard devices. The command DESCRIBE will give you a one-line description of a given device. It will by default list all devices in /dev. SEE ALSO
mknod(8). BUGS
MAKEDEV's eagerness to create devices may cause many "File exists" errors from mknod. AUTHOR
Kees J. Bot (kjb@cs.vu.nl) MAKEDEV(8)
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