IJ10418: FIXED RG RESIGN DUE TO INCORRECT MEDIA/CHECKSUM ERROR

APAR status

• Closed as program error.

Error description

• If pdisk corruption occurs, for example if a bad SAS HBA card
  or bad CPU chip causes silent data corruption on writes to
  pdisks, then after the problem hardware has been repaired, the
  system can continue to report misleading "I/O error", "err 110"
  messages, and may continually resign and recover service of the
  recovery group, causing recovery from the corruption to take an
  unexpectedly long time.
  

Local fix

• na
  

Problem summary

• If pdisk corruption occurs, for example if a bad SAS HBA card
  or bad CPU chip causes silent data corruption on writes to
  pdisks, then after the problem hardware has been repaired, the
  system can continue to report misleading "I/O error", "err 110"
  messages, and may continually resign and recover service of the
  recovery group, causing recovery from the corruption to take an
  unexpectedly long time.
  

Problem conclusion

• The fix eliminates the misleading "I/O error", "err 110"
  messages
  and prevents the system from continually resigning and
  restarting.
  
  Work around:
  None.
  
  Problem trigger:
  The problem is triggered by checksum errors detected on pdisks.
  This can be triggered by faulty hardware that writes incorrect
  data to disk without reporting any errors back or it may be
  caused by a malicious program writing over the disk drives.
  
  Symptom:
  Performance Impact/Degradation
  
  Platforms affected:
  ALL Operating System environments
  
  Functional Area affected:
  ESS/GNR
  
  Customer Impact:
  High Importance
  
  Changed Externals:
  None.
  

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

• R502 PSY U883600

     UP18/12/18 I 1000