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SubjectRe: How come dd if=/dev/zero of=/nfs/dev/null does not send packets over the network?
Hi,

As far as I understand devices in Linux, device file is only some kind of
note to the *local* kernel that operations on that file is to be
redirected to the device. It is always resolved by the local kernel and
redirected to the local device (if tere is driver that claims this
major/minor number). Life would be to simple...


Grzegorz Kulewski


On Wed, 2 Jun 2004, Piszcz, Justin Michael wrote:

> root@jpiszcz:~# mkdir /p500/dev
> root@jpiszcz:~# mount 192.168.0.253:/dev /p500/dev
> root@jpiszcz:~# echo blah > /p500/dev/null
> root@jpiszcz:~# ls -l /p500/dev/null
> crw-rw-rw- 1 root sys 1, 3 Jul 17 1994 /p500/dev/null
> root@jpiszcz:~# dd if=/dev/zero of=/p500/dev/null
>
> 6179737+0 records in
> 6179736+0 records out
>
> Instead it treats it as a local block device?
>
> Kernel 2.6.5.
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