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Server crash with "dd" command [message #36581]

Thu, 02 July 2009 13:11

dvazart
Messages: 37
Registered: October 2008
Location: France

Member

Hi again !

doing test on my server, I make it hang (HN) running two commands like (in to a VE) :

dd if=/dev/zero of=test bs=1024 count=2000000 && time cp test /tmp/test

I was launched two times this command and my CPU reaches 100% and then it was impossible to take the control by SSH.

Its there a especial UBC parameter to restrict this ?? im trying with --ioprio but not seems to work.

Thanks.

----------- Daniel Vazart ------------
"Knowledge is power, Sharing is human"
------- http://www.vazart.net --------

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Re: Server crash with "dd" command [message #36595 is a reply to message #36581]

Fri, 03 July 2009 09:13

maratrus
Messages: 1495
Registered: August 2007
Location: Moscow

Senior Member

Quote:

I was launched two times this command and my CPU reaches 100% and then it was impossible to take the control by SSH.

Probably CPU parameters were not set properly.

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Re: Server crash with "dd" command [message #36596 is a reply to message #36581]

Fri, 03 July 2009 09:51

dvazart
Messages: 37
Registered: October 2008
Location: France

Member

Thanks.

Yeah, i'm testing with the options CPUUNITS, CPULIMITS and CPUS and it seems to be solved !

----------- Daniel Vazart ------------
"Knowledge is power, Sharing is human"
------- http://www.vazart.net --------

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