IJ42283: LOG GROUP CAN BE UNAVAILABLE WHEN RG FAILS TO RECOVER AND PDISK IS RECOVERED FROM MISSING STATE

APAR status

• Closed as program error.

Error description

• A race between recovery group recovery and pdisk state update
  broadcasting may make pdisk appear as missing which will
  prevent log group recovery and block I/O.
  

Local fix

• Restart the gpfs daemons running on the GNR
  nodes that manage the affected recovery group
  

Problem summary

• A race between recovery group recovery and pdisk state update
  broadcasting may make pdisk appear as missing which will
  prevent log group recovery and block I/O.
  

Problem conclusion

• This problem is fixed in 5.1.5 PTF 1
  To see all Spectrum Scale APARs and
  their respective fix solutions refer to page
  https://public.dhe.ibm.com/storage/spectrumscale/spectrum_scale_
  apars.html
  
  Benefits of the solution:
  Fixed the code to allow pdisk state version to increment
  as it always has but we delay any state update broadcast
  until any in-progress RG recovery completes.
  
  Work Around:  Restart the gpfs daemons running on the GNR
  nodes that manage the affected recovery group
  Problem trigger
  Recovery group and log group failure from too many missing
  pdisks that could be caused by bad disks, nodes, or network.
  Symptom: Stuck IO
  Platforms affected:  Linux Only
  Functional Area affected: ESS/GNR
  Customer Impact: High Importance
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  SPEC SCALE STD

• Fixed component ID

  5737F33AP

Applicable component levels