backing up /sys
Bob McClure Jr
robertmcclure at earthlink.net
Thu Jun 30 15:04:19 UTC 2005
On Thu, Jun 30, 2005 at 05:45:29PM +0400, Alexey Fadyushin wrote:
> Bob McClure Jr wrote:
>
> >I'm in the process of checking out a CD/DVD-based backup package.
> >
> >http://www.bluehaze.com.au/unix/cdbkup.html
> >
> >In my first test, I noticed in the error log a bunch of carps about
> >file sizes changing in /sys. I know that /proc is a pseudo filesystem
> >comprising nothing but hooks into the kernel, and I know that I don't
> >want to back that up. /sys looks like the same sort of thing, full of
> >directories that take up 0 bytes, down to files that ls reports as
> >4096 bytes.
> >
> >Is it safe to assume I don't want to backup /sys?
> >
> >Cheers,
> >
> >
> /sys is a mount point for sysfs filesystem. Sysfs is a virtual
> filesystem similar to procfs in 2.6 line of Linux kernels.
> From the kerlnel documentation (menuconfig help):
>
> The sysfs filesystem is a virtual filesystem that the kernel uses to
> export internal kernel objects, their attributes, and their
> relationships to one another.
>
> Therefore, you do not need to backup it, the filesystem and its content
> will be recreated by kernel when mounted.
>
> Alexey Fadyushin.
> Brainbench MVP for Linux
> http://www.brainbench.com
Ok, now I have a question. "mount" shows (among other things)
none on /proc type proc (rw)
but no equivalent for /sys. If I
cd /
find . -depth -mount | cpio -o ....
I know it will record /proc but none of its contents. Will it treat
/sys the same way? Or would a restore from such a backup be innocuous
as far as the contents of /sys goes?
Cheers,
--
Bob McClure, Jr. Bobcat Open Systems, Inc.
robertmcclure at earthlink.net http://www.bobcatos.com
God doesn't have (or need) a Plan B.
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