QuestionQ12

Advanced Kernel Debugging

You need to run a kernel debug for a longer period because the problem occurs only once or twice per week. Therefore, you must add a timestamp to the kernel debug and write its output to a file, but you cannot afford to consume all remaining disk space and have only 10 GB free for saving the debugs. What is the correct syntax for this?

  • A fw ctl kdebug -T -f -m 10 -s 1000000 -o debugfilename
  • B fw ctl kdebug -T -f -m 10 -s 1000000 > debugfilename
  • C fw ctl kdebug -T -m 10 -s 1000000 -o debugfilename
  • D fw ctl debug -T -f -m 10 -s 1000000 -o debugfilename
Explanation

fw ctl kdebug -T -f -o collects continuous, timestamped kernel-debug output into files. The -m 10 and -s 1000000 parameters configure 10 cyclic files of 1,000,000 KB each, bounding retained debug output to approximately 10 GB.

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