Re: cpio trouble with 2.2.10-ac4 SMP

Thierry Danis (danis@sagem.fr)
Mon, 28 Jun 1999 10:55:43 +0200

On Sat, Jun 26, 1999 at 05:37:49PM +0200, Thierry Danis wrote:
>
> Hello,
>
> I have observed a strange behaviour using cpio on a 2.2.10-ac4 SMP box.
>
> strichnine is the SMP box.
> dgps6 is a 2.2.10-ac4 UP box.
> willy is a 2.2.10-ac4 UP box.
>
> >From dgps6, as root :
> # rsh strichnine 'cd /usr; find . -depth -print | cpio -ovB' >/dev/null
>
> The command ends up prematuraly (in the middle of X11R6). No log on either
> machine.
>
> # rsh strichnine 'cd /usr; tar cvf - .' >/dev/null
>
> The command completes normally.
>
>
> >From dgps6, as root :
> # rsh willy 'cd /usr; find . -depth -print | cpio -ovB' >/dev/null
>
> The command completes normally.
>
>
> To summary, a cpio on an SMP box sent to /dev/null through the network dies.
> As a consequence, it is impossible to backup the SMP box using cpio.
>
> A+,
> --
> Thierry Danis
> Poste : 53 53 danis@spmo.sagem.fr
>

Some more info :

>From strichnine as root :
# cd /usr; find . -depth -print | cpio -ovB | rsh dgps6 dd of=/dev/null

The command completes normally.

>From dgps6 as root :
rsh strichnine 'cd /usr; find -depth | cpio -ovB' | dd of=/dev/null

The command stops very early (as mentionned in the first post). But :

rsh strichnine 'cd /usr; find -depth | strace -o/tmp/cpio.output cpio -ovB' | dd of=/dev/null

The command continues a bit further and then stops (without ending).

So, having added 'strace -o/tmp/cpio.output' (or strace -o/dev/null)
makes things apparently go better, but now hangs after a few Mo of data
transferred.

30221 root 0 0 388 388 312 S 0 0.0 0.3 0:00 find
30222 root 4 0 492 492 396 S 0 0.0 0.3 0:03 strace
30223 root 2 0 424 424 348 T 0 0.0 0.3 0:01 cpio

I have to kill the command with a ^Z + kill -9 %1.

A+,

-- 
	Thierry Danis
	Poste : 53 53	danis@spmo.sagem.fr


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