Solutions Log » netcat http://solutions.unixsherpa.com by Dan Reiland Fri, 16 Apr 2010 20:28:57 +0000 en hourly 1 http://wordpress.org/?v=3.0 Remote Mirroring Using nc and dd http://solutions.unixsherpa.com/2009/08/10/remote-mirroring-using-nc-and-dd/ http://solutions.unixsherpa.com/2009/08/10/remote-mirroring-using-nc-and-dd/#comments Mon, 10 Aug 2009 16:58:06 +0000 Dan http://solutions.unixsherpa.com/?p=160 You can use the dd and nc commands for exact disk mirroring from one server to another. The following commands send data from Server1 to Server2:

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Server2# nc -l 12345 | dd of=/dev/sdb
Server1# dd if=/dev/sda | nc server2 12345

Make sure that you issue Server2's command first so that it's listening on port 12345 when Server1 starts sending its data.

Unless you're sure that the disk is not being modified, it's better to boot Server1 from a RescueCD or LiveCD to do the copy.

Reference: http://www.linuxjournal.com/content/tech-tip-remote-mirroring-using-nc-and-dd

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