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What's cf_hwassist_missedKeepAlive timeout and tolerant period?

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Category:
fas-systems
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hw
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Applies to

  • NetApp AFF and FAS systems
  • Data ONTAP 8 7-Mode
  • Clustered Data ONTAP 8
  • Clustered Data ONTAP 9

Answer

cf_hwassist_missedKeepAlive incident is record in EMS after 60 seconds after a hw-assist packet sent.

For hw-assist packets, it's sent by UDP every 180 seconds, so there is not retransmit of packets if they are sent and not received. If a UDP packet is dropped, blocked, wedged, redirected, etc... and a node doesn't receive, it will just wait 180 seconds until the next one is sent.

So if a cf_hwassist_recvKeepAlive event showing within 120 seconds after cf_hwassist_missedKeepAlive, if could be ignored safely.

Additional Information

For the cause of cf_hwassist_missedKeepAlive, because hw-asssit configured and transmit with IP and port(default 4444) on e0M which goes through customer network environment, nearly every instance of this type of failure, is due to network dropped packets.