IJ12094: MMAFMCTL USES TRUNCATED HOSTNAMES

APAR status

• Closed as program error.

Error description

• In some situations where hosts having different domain
  names belong to the same GPFS cluster, it is possible
  for the mmafmctl command to display an incorrect
  hostname.
  It is also possible for the mmafmctl command to fail to
  recognize the hostname of a gateway node.
  
  For example, these 2 hosts are part of a GPFS cluster:
  
  node1.dom1.company.com
  node2.dom2.company.com
  
  Some GPFS commands might decide that "company.com"
  is the common domain, and then decide to treat node1 as
  "node1.dom1" and node2 as "node2.dom2".
  
  Now, if "node1.dom1" and "node2.dom2" cannot be found
  in /etc/hosts, or cannot be resolved in any other way,
  this could lead to errors in the mmafmctl command when
  it tries to resolve such hostnames and fails.
  

Local fix

• The issue can be avoided by adding aliases to /etc/host
  that correspond to these truncated hostnames (for example
  node2.dom2).
  

Problem summary

• mmafmctl command uses short hostname for the gateway.
  This might cause problems if the nodes from different
  domains are added to the cluster and short hostname
  evaluated by the daemon might not match the actual
  hostname.
  

Problem conclusion

• Fixed the code to use fully qualified hostname of the
  gateway node for all AFM operations.
  
  Work around:
  Add short hostname to the /etc/hosts file
  
  Problem trigger:
  AFM is used in a cluster with inconsitent or different
  domain names.
  
  Symptom:
  Unexpected Results/Behavior
  
  Platforms affected:
  Linux
  
  Functional Area affected:
  AFM
  
  Customer Impact:
  High Importance
  
  Changed Externals:
  None
  

Temporary fix

Comments

APAR Information

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

  IJ12041

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

Fix information

• Fixed component name

  SPECTRUM SCALE

• Fixed component ID

  5725Q01AP

Applicable component levels

• R423 PSY U885024

     19/06/28 I 1000