IJ54043: THE 'THIN INODE'IS DEALLOCATED AND THE EMERGENCY SPACE IS DELETED DURING REPAIR OPERATION.

APAR status

• Closed as program error.

Error description

• When a file system maintenance command - mmrestripefs - or disk
  maintenance command - mm{ch,del,rpl}disk - run, the 'thin inode'
  is deallocated and the emergency space is deleted. This is
  unexpected behavior and could be a problematic if the file
  system gets OOS (Out-Of-Space) condition.
  

Local fix

Problem summary

• When a file system maintenance command - mmrestripefs - or disk
  maintenance command - mm{ch,del,rpl}disk - run, the 'thin inode'
  is deallocated and the emergency space is deleted. This is
  unexpected behavior and could be a problematic if the file
  system gets OOS (Out-Of-Space) condition.
  

Problem conclusion

• Benefits of the solutions:
  The emergency space won't be deleted so that thin inode will not
  be deallocated.
  
  Work Around:
  None
  
  Problem trigger:
  Run one of the command - mmrestripefs or mm{ch,del,rpl}disk
  
  Symptom:
  After one of the commands run, the 'thin inode' in the internal
  dump will reset to -1 indicating that the 'thin inode' is
  deallocated and 'nBlocks' will be 0 indicating the emergency
  space is deleted.[root@c145f11san04b sju]# mmfsadm dump stripe |
  egrep "State of|thin inode"State of StripeGroup "test" at
  0x18042A6A5B0, uid 7491A8C0:67D9B824, local id 1:      
  
  0: name 'system' Valid nDisks 32 nInUse 32 id 0 poolFlags 2
  thin inode 41 nBlocks 519      
  
  1: name 'data' Valid nDisks 16 nInUse 16 id 65537 poolFlags 2
  thin inode 42 nBlocks 526      
  
  2: name 'flash' Valid nDisks 8 nInUse 8 id 65538 poolFlags 2
  thin inode 43 nBlocks 526[root@c145f11san04b sju]# mmrestripefs
  test -R -N nc1
  ...
  [root@c145f11san04b sju]# mmfsadm dump stripe | egrep "State
  of|thin inode"State of StripeGroup "test" at 0x18042A6A5B0, uid
  7491A8C0:67D9B824, local id 1:      
  
  0: name 'system' Valid nDisks 32 nInUse 32 id 0 poolFlags 2
  thin inode -1 nBlocks 0      
  
  1: name 'data' Valid nDisks 16 nInUse 16 id 65537 poolFlags 2
  thin inode -1 nBlocks 0      
  
  2: name 'flash' Valid nDisks 8 nInUse 8 id 65538 poolFlags 2
  thin inode -1 nBlocks 0
  
  Platforms affected:
  Linux/AIX
  
  Functional Area affected:
  thin-provisioning
  
  Customer Impact:
  Mid 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