IJ44774: GSKIT ISSUE WITH AMD EPYC FAMILY 25 PROCESSORS

APAR status

• Closed as program error.

Error description

• Commands like mmcrcluster or mmaddnode may hang in GSKIT
  layer on AMD EPYC family 25 processors.  A particular model
  from family 25 that is known to hang in GSKIT layer is
  AMD EPYC 7343.
  

Local fix

• Add "ICC_SHIFT=3" line in
  /usr/lpp/mmfs/lib/gsk8/Cicc/icclib/ICCSIG.txt
  file on problem nodes.
  

Problem summary

• Commands like mmcrcluster or mmaddnode may hang in GSKIT
  layer on AMD EPYC family 25 processors.  A particular model
  from family 25 that is known to hang in GSKIT layer is
  AMD EPYC 7343.
  

Problem conclusion

• This problem is fixed in 5.1.2.9
  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:
  Apply the GSKIT hang workaround automatically on AMD EPYC
  family 25 processors
  
  Work Around:
  Add "ICC_SHIFT=3" line in
  /usr/lpp/mmfs/lib/gsk8/Cicc/icclib/ICCSIG.txt
  file on problem nodes.
  
  Problem trigger:
  This problem affects AMD EPYC family 25 processors
  
  Symptom:
  Admin commands hangs
  
  Platforms affected:
  Linux OS environments
  
  Functional Area affected:
  Admin Commands, gskit
  
  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:

  IJ44840

Fix information

• Fixed component name

  SPEC SCALE STD

• Fixed component ID

  5737F33AP

Applicable component levels