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Old 11-11-2004, 12:12 PM   #1
scoob8000
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cloning with DD and NC


Is it safe to clone a running system over a network with DD and netcat?

The system I need to backup would be a rh9 system runing at runlevel 3, doing just about nothing.

-scoob8000
 
Old 11-12-2004, 08:59 AM   #2
scoob8000
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Well, I tested this and it worked.

Did I get lucky, or is this safe to make a reliable backup?

-scoob8000
 
Old 11-12-2004, 09:25 AM   #3
kees-jan
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This kind of depends on how you define "safe". But, depending on the processor load
  • The filesystem you copy may be inconsistent
  • The files themselves may be in an inconsistent state (especially databases)
  • You may loose data
  • System status information (i.e. what services are running) may not be correct, and you may encounter bugs in the scripts that recover from that situation.
  • Possibly other mayhem

There are companies that claim they can safely backup a running system, but I still have to figure out what they mean with safe (i.e. against which of the above they protect) and how they do it.

For now, I gues you got lucky. But you did have a fair chance of being lucky, since the box was doing virtually nothing :-)

Groetjes,

Kees-Jan
 
Old 11-12-2004, 12:34 PM   #4
scoob8000
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Basically by "safe" I meant I would wind up with a usable clone..

I would normally boot to a rescue disk, but this one problemsome system doesnt like to boot off cds, and it lacks a floppy drive.. heh

-scoob8000
 
  


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