FIFO string

[Nick4704]

Hi

Can anybody share a documentation about Netapp FIFO string decoding?

There is a topic  in NCSE exam "Describe how to decode FIFO strings", I can find NO information about it.

Any information is appriciated.

Thank you

Nick

[aborzenkov]

I am aware of a single internal KB article that mentions it. May be some information is contained in service partner training, but those materials I have do not have anything.

I got feeling that exam is heavily oriented towards internal stuff, not partners. 

[Nick4704]

Thanks for a quick reply Andrei.

I struggled with FIFO during NAHSE certification, and I picked tiny pieces of information in bug reports.

Can you share anything you have? If you can't do that, can you share KB internal id/URL, I can ask Netapp staff to send it to me?

NCSE-Specialist and NCSE certifications are mandatory for FY19 ONTAP Support Specialist, which is (was) required for partner ASP status.

[Nick4704]

Looks like I've found information:

https://kb.netapp.com/app/answers/answer_view/a_id/1071055

The following FIFO string is reported when running the sp status -d command:

ONTAP Shutdown BBSP:C=00 L=2F FIFO: F0 F1 F3 F2 5 B2 0 0 10 84 20 E F E0 C0 C2 D E F 10 12 13 14 14 15 15 13 12 16 17 19 19 1A 1A 17 16 1B 1B 1C 1C 10 F 1E 1E 1F 1F E D D E F 10 12 13 14 14 15 15 13 12 16 17 19 F2 F1 F0 F3

Break down the FIFO string into the individual components:

• <F2 F1 F3 F2> # all 4 cores enter machine check handler
  <5 B2 0 0 10 84 20 E F> # machine check bank 5 records the error, status
  <E0> # core 0 is handling the machine check error
  <C0> # enter chipset error handler
  <C2> # enter PCI error handler
  <D E F 10 12 13 14 14 15 15 13 12 16 17 19 19 1A 1A 17 16 1B 1B 1C 1C 10 F 1E 1E 1F 1F E D> # PCI bus has been probed once, no hangs

[born_iv]

@Nick4704, which FIFO string should NOT be used to determine root cause?

A) before NMI BBSP: C=00 L=00

B) BIOS exit BBSP:C=2F L=00

C) ONTAP shutdown BBSP:C=00 L=2F

D) before reset BBSP: C=00 L=00

[Anishjacob76]

before NMI BBSP: C=00 L=00

FIFO  F0 F1 F3 F> # all 4 cores enter machine check handler