IJ35567: IMPROVE RDMA CONNECTION SETUP ERROR HANDLING ON NSD CLIENTS

APAR status

• Closed as program error.

Error description

• When using RDMA via RoCE, there are certain
  network error scenarios where not all possible
  RDMA connections from a NSD client to a
  NSD server are established.
  

Local fix

Problem summary

• When using RDMA via RoCE, there are certain
  network error scenarios where not all possible
  RDMA connections from a NSD client to a
  NSD server are established.
  

Problem conclusion

• This problem is fixed in 5.1.2  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:
  
  Even with network errors all possible
  RDMA connections are established.
  
  Work Around:
  None.
  
  Problem trigger:
  - the NSD server port has no IP address assigned
  - RDMA Connection Manager address or
  route resolution fails
  - RDMA Connection Manager connection request fails
  
  Symptom:
  Network Performance
  
  Platforms affected:
  ALL Linux OS environments
  
  Functional Area affected:
  RDMA
  
  Customer Impact:
  Suggested
  

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