Date: Fri, 9 Jul 2010 20:09:27 +0200 From: Thomas <fwd@gothschlampen.com> To: Robert Bonomi <bonomi@mail.r-bonomi.com> Cc: freebsd-questions@freebsd.org Subject: Re: slow down dd - how? Message-ID: <20100709180927.GA20367@gothschlampen.com> In-Reply-To: <201007090644.o696i0QK028217@mail.r-bonomi.com> References: <201007090644.o696i0QK028217@mail.r-bonomi.com>
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On Fri, Jul 09, 2010 at 01:44:00AM -0500, Robert Bonomi wrote: Hi, > > > How can I slow down dd? > > > > you could use some creative shellscripting (probably in addition to idprio): > > > > dd if=/dev/zero bs=1024k | ( dd bs=1024k count=10; sleep 3 ) | dd bs=1024k of=/dev/somewhere > > > > This pauses for 3 seconds for every 10MB written. ... > > I must be missing something. > > Doesn't that "dd ... ; sleep" in the sub-shell need to be in a _loop_ of some > sort? You're absolutely right. I probably should get more sleep. Of course it needs to be in a loop, something like "( while dd bs=1024k count=10; do sleep 3; done )" should do the trick. Sorry for the confusion. Regards Thomas
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