IT18456: PUREAPPLICATION SYSTEM: UNABLE TO USE GPFS CLIENT POLICY TO MOUNT A GPFS FILESYSTEM WITH BLOCKSIZE IN EXCESS OF 1 MB

IBM PureApplication System Version 2.2.3.0

APAR status

• Closed as program error.

Error description

• When deploying a GPFS cluster on PureApplication System using
  the virtual application pattern, you can specify the block size
  for the filesystem (s) within that cluster.
  
  The default block size is 256 KB, which is typically
  recommended. The block size of each filesystem within the
  cluster must be <= maxblocksize on the GPFS cluster. By default
  GPFS server cluster maxblocksize is set to 1 MB, but the GPFS
  virtual application pattern automatically increases the cluster
  maxblocksize when a file system is created with a block size
  larger than 1MB.
  
  However the GPFS client cluster (which is created and used by
  the virtual machines that use the GPFS client policy to mount a
  GPFS filesystem from the GPFS cluster) also has a maxblocksize
  set, again by default to 1 MB.  This client cluster
  maxblocksize value cannot be updated by the user at client
  deployment time and it is not automatically increased when the
  client is trying to mount a GPFS shared file system which has a
  block size larger than 1MB.
  
  As a result the GPFS client policy fails and the client
  instance goes into an error state if, at deployment time, it
  tries to mount a GPFS file system with a block size larger than
  1MB.
  
  A GPFS file system with a block size larger than 1MB can be
  mounted by the client instance only after deployment. Before
  mounting the file system and creating the local link,  the user
  should change the client cluster maxblocksize value by calling
  this command  /usr/lpp/mmfs/bin/mmchconfig
  maxblocksize=<fileSystemBlockSize>
  

Local fix

• Contact IBM Support
  

Problem summary

• The code needed to be updated to accept a maximum block
  size parameter and process a maximum block size update
  operation.
  

Problem conclusion

• A code fix is being provided in PureApplication System and
  BlueMix Local System version 2.2.3.0 in GPFS Pattern Type
  1.2.8.0.
  

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

  PAPP SYS 8382 I

• Fixed component ID

  5725G3200

Applicable component levels

• R223 PSY

     UP