IJ32560: AFMCOS: COPY A UNCACHED FILE VIA SMB CLIENT MIGHT FAIL

APAR status

• Closed as program error.

Error description

• When a AFM-COS fileset is exported as SMB share,
  copy an uncached file from a SMB client might fail.
  
  Reported In:
  Spectrum Scale 5.1.0.1
  
  Known Impact:
  Copy failure
  
  Verification steps:
  You might see below error logs in the GPFS log file of
  AFM-COS fileset's gateway node:
  /var/adm/ras/mmfs.log.latest:
  
  [E] AFM: Read file system gpfsfs fileset afmcos-fileset
  file IDs [1055744.1055744.-1.-1,N] name / remote error 13
  Permission denied
  [I] AFM: Previous error repeated 3 times.
  [E] AFM: SetXAttr file system gpfsfs fileset
  afmcos-fileset file IDs [-1.1055745.-1.-1,N] name  remote
  error 2
  : Specified entity, such as a disk or file system, does
  not exist.
  

Local fix

• 1. Open the uncached file directly to trigger the
  caching,
   and then copy the file after file fully cached.
  - or -
  2. Copy the uncached file directly from CES node
  

Problem summary

• Copy of uncached file from Samba share
  fails with object backend while
  writing data to cache.There is another issue if
  setXattr operation is in the queue, a sync read
  for the same file fails to return
  data to the application.
  

Problem conclusion

• Benefits of the solution:
  No more object backend errors. No more failed reads.
  
  Work Around:
  Add node names to /etc/hosts file
  
  Problem trigger:
  Read uncached file from Samba
  share of the AFM cache.
  
  Symptom:
  Read operation fails.
  
  Platforms affected:
  Linux Only
  
  Functional Area affected:
  AFM
  
  Customer Impact:
  Suggested
  

Temporary fix

Comments

APAR Information

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

  IJ32182

• 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