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Sun Fire[TM] 3800-6800: Troubleshooting NCPQ_TO errors (Doc ID 1017926.1)

Last updated on APRIL 20, 2021

Applies to:

Sun Fire 3800 Server - Version Not Applicable and later
Sun Fire 4800 Server - Version Not Applicable and later
Sun Fire 6800 Server - Version Not Applicable and later
All Platforms



This document aids in troubleshooting Non-Cacheable Pending Queue Time Outs (NCPQ_TO) on Sun Fire 3800/4800/4810/6800 systems.  NCPQ_TOs occur when data requests in Non-Cacheable address space do not complete a transaction. Non-Cacheable addresses space is Safari Device config and I/O address space.

In most situations this is a type of error that requires Support Services to be engaged in order to be resolved.  Please review the document to see if the resolution to this issue is available within, but if not, you will likely be required to log a Service Request with Support Services to get resolution.  Please mention this article when logging the Service Request.


Error messages indicating a NCPQ_TO occurred are seen on the Domain Console.  The error messages are also stored in the Domain Console Buffer and can be retrieved by the Sun Fire System Controller (SC) command showlogs.  If a loghost is configured, the error messages are stored on the loghost.  NCPQ_TOs can occur during normal operation of the Domain or during POST.

Here is an example log of a NCPQ_TO error:

Feb 26 10:46:02 [Hostname] DomC.SC: ErrorMonitor:Domain C has a SYSTEM ERROR
Feb 26 10:46:02 [Hostname] DomC.SC: /N0/SB1 encountered the first error
Feb 26 10:46:02 [Hostname] DomC.SC: RepeaterSbbcAsic reported first error on /N0/SB1
Feb 26 10:46:02 [Hostname] DomC.SC: /partition1/domain0/SB1/bbcGroup0/sbbc0:
FE [15:15] : 0x1
ErrSum [31:31] : 0x1
SafErr [09:08] : 0x1 Fireplane device asserted an error
Feb 26 12:20:47 [Hostname] DomC.SC: /partition1/domain0/SB1/bbcGroup0/cpuAB/cpusafariagent0:
AFAR (high)[0x531] : 0x0000063c
AFAR [42:32] [10:00] : 0x63c
AFAR (low)[0x541] : 0xff800000
AFAR_2 (high)[0x571] : 0x0000063c      < 
AFAR_2 [42:32] [10:00] : 0x63c  
AFAR_2 (low)[0x581] : 0xff800000       < 
AFSR (high)[0x551] : 0x00080000 
PERR [19:19] : 0x1 
AFSR_2 (high)[0x591] : 0x00080000 
PERR [19:19] : 0x1 
EMU B[0x511] : 0x03000000 
AID_LK [24:24] : 0x1 
NCPQ_TO [25:25] : 0x1


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