At Tue, 6 Jul 2010 10:01:10 -0400 CentOS mailing list centos@centos.org wrote:
Jerry McAllister wrote:
On Tue, Jul 06, 2010 at 06:41:06PM +0800, Tang Jianwei wrote:
I tried to create some swap files in /dev directory for my desktop. the dd and mkswap were ok. but when I try to swapon it, i get this:
# swapon /dev/myswap swapon: /dev/myswap: Invalid argument
but when I mv the file to some other directory like /mnt or /, the swapon works.
could sb. tell me why?
Well, /dev is *not* a good place for anything but device files.
/dev is not a real directory for data files.
<snip> Um, er, what do you mean about it not being a "real" directory?
It is not 'persistent' across boots. It is not backed by actual hard disk space. Any *data* files (including swap files) will be gone at the next reboot. The *device* files are re-created by udevd during the boot process (and later on by the hotplug / HAL subsystem).
mark-- When I hear about object oriented systems, I think of one that's been around for about 40 years: *Nix. Everything's a file, er, "object", and you pipe, er, message from one object to another....
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