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After TO/GB LUNs show paths in transitioning state

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ontap-9
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san
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Applies to

  • All versions of Clustered ONTAP prior to 9.5P4
  • All SAN hosts 

Issue

Data OnTap provides three ALUA states for filer paths:

  • Active/optimized (to the node that owns the lun)
  • Active/non-optimized (to any node that does not own the lun)
  • Transitioning

The transitioning state should only be seen briefly during a takeover or giveback as the path transitions from one active state to another.

In some situations the paths become stuck in "transitioning" and the host is unable to use them.

  • Windows may report the path state as "transitioning" in DSM. 
  • ESX will report IO errors and sense data returned as 0x2 0x4 0xa.  
  • Aix throws the below errors 
    May 30 00:39:07 hdisk1     P SC_DISK_ERR2        path  0 TEST UNIT READY  CHECK NOT READY; LOGICAL UNIT NOT ACCESSIBLE, 
ASYMMETRIC ACCESS STATE TRANSITION
May 30 00:38:53 hdisk0     P SC_DISK_ERR2        path 10 TEST UNIT READY  CHECK NOT READY; LOGICAL UNIT NOT ACCESSIBLE, 
ASYMMETRIC ACCESS STATE TRANSITION

 

 

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