Cloning A Hard Disk Over The Network Using Ultrix

Rob Jarratt robert.jarratt at
Mon Oct 23 04:26:30 CDT 2017

The rsh solution worked for me actually. I used this:


dd if=/dev/rrz1c conv=noerror,sync | rsh ult1 dd of=/usr/rz1.dd


Where “ult1” was the remote node






From: Huw Davies [mailto:huw.davies at] 
Sent: 23 October 2017 09:32
To: rob at; Rob Jarratt <robert.jarratt at>; General Discussion: On-Topic and Off-Topic Posts <cctalk at>
Subject: Re: Cloning A Hard Disk Over The Network Using Ultrix



On 21 Oct 2017, at 21:40, Rob Jarratt via cctalk <cctalk at <mailto:cctalk at> > wrote:


I have a couple of hard disks I want to make dd copies of. I have Ultrix
running on my DECstation 5000/240 with the disk I want to clone attached to
it. The trouble is that I don't have enough disk space on the machine to
clone the disk and then grab the image using FTP. I have been trying to find
a way to pipe the dd output over the network to a SIMH Ultrix machine that
has plenty of disk space. I tried piping dd into rcp, but rcp doesn't seem
to take input from standard input. I have looked at cpio, but that too
appears not to accept input from standard input.

Unix is not my strong point. Are there any other ways I could pipe the dd
output across the network to a machine that has enough disk space?


netcat (nc) is the usual tool to do this on Unix type systems. Whether it’s available for Ultrix I don’t know but it may ‘just compile’.


If not, it’s not hard to write two simple programs to read from stdin and output to a TCP/IP socket on another host and the second to read from the socket and output to stdout.


If I had to write the programs I’d either google for an example to copy or have a read of Stevens “TCP/IP illustrated” book series - the only risk of reading them (there are 3 volumes) is that you can spend 6 months just learning and not doing :-)'


Huw Davies           | e-mail: Huw.Davies at <mailto:Huw.Davies at> 

Melbourne            | "If soccer was meant to be played in the

Australia            | air, the sky would be painted green" 


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