IJ49660: AFM REPLICATION ROLE CHANGES - REPLICATION NOT WORKING

APAR status

• Closed as program error.

Error description

• When replicating over NFS With KRB plus AD - if there's a user
  who is not included in the AD at the primary site who creates a
  File, this file is replicated as root to the DR first and then a
  Setattr is attempted with the User/Group to which file/dir
  belongs to. If the user doesn't exist on AD and is local to
  Primary cluster alone, then NFS prevents the Setattr and ergo
  the whole Create operation from Primary to DR gets stuck with
  E_INVAL.
  

Local fix

Problem summary

• When replicating over NFS With KRB plus AD - if there's a user
  who is not included in the AD at the primary site who creates a
  File, this file is replicated as root to the DR first and then a
  Setattr is attempted with the User/Group to which file/dir
  belongs to. If the user doesn't exist on AD and is local to
  Primary cluster alone, then NFS prevents the Setattr and ergo
  the whole Create operation from Primary to DR gets stuck with
  E_INVAL.
  

Problem conclusion

• This problem is fixed in 5.1.9.2
  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:
  Introducing a special (hidden) config for such situations to be
  tuned at the cluster level for AFM Setattr operation to ignore
  EINVAL from the remote site in such situations and continue with
  the replication.
  
  Work Around:
  None
  
  Problem trigger:
  Trying AFM DR Replication with
  NFS + KRB + AD. Having a local user who is not present on the AD
  - leading to NFS rejecting the user id related operations at the
  DR and leading to queue being stuck.
  
  Symptom:
  Unexpected Behavior
  
  Platforms affected:
  Linux Only
  
  Functional Area affected:
  AFM
  
  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