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In the original form of device error injection, it was an all or nothing situation. To help simulate intermittent error conditions, you can now specify a real number percentage value. This is also very useful for our ZFS fault diagnosis testing and for injecting intermittent errors during load testing. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Don Brady <don.brady@intel.com> Closes #6227