QuestionQ9

Storage Systems Recovery and Troubleshooting for Partners

Which two statements correctly describe L1 and L2 Watch Dog Resets (WDR)?

Choose two
  • A L2 WDR requests creation of a core dump before reset.
  • B L1 WDR is initiated after 0.5 seconds from the event.
  • C L1 WDR performs a soft reset.
  • D L2 WDR is initiated after 2 seconds from the event.
Explanation

NetApp platform documentation on handling watchdog resets describes the Level 1 event as the controller attempting to panic and write a core file so the hang can be diagnosed, after which the system resumes service without a full hardware reset, which is the behavior of a soft, in-place recovery; only if the condition persists does the watchdog timer escalate, about two seconds after the L1 event, to a Level 2 event that forces the appliance through a hard reset signal from the timer and does not generate a core dump. This places the diagnostic soft-recovery behavior at L1 and the delayed, harder timer-driven reset roughly two seconds later at L2.

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