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I have a machine that suffers periods of resource contention (CPU or Memory or Disk or some combination) and I don't want Rsync to add to the problem when that occurs. Is it possible to setup Rsync to that it "slows dow" or stops during periods of contention (effectively being lazy)?

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It depends on the resource, but you can do the following:

  • CPU: set the nice level of the process to a high value (lower it's priority)
  • Disk: set the ionice level of the process to an idle scheduling class
  • Network: use tc to set the network TOS or use the --bwlimit arguement
  • Memory: Interesting one - there's some complex methods using systemd or cgroups.

See this thread for more details: Nice rsync on remote machine

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