IT20346: SNAPDIFF BACKUP REPORTS MORE OBJECTS "TOTAL SNAPSHOT DIFFERENCE OBJECTS" THAN EXPECTED

IBM Spectrum Protectâ„¢ Client 8.1.2 Downloads and READMEs
IBM Spectrum Protectâ„¢ Client 7.1.8 Downloads and READMEs

APAR status

• Closed as program error.

Error description

• In the following snapdiff backup statistics,
  
  Total number of objects inspected:            4
  Total number of objects backed up:        5 928
  Total number of objects updated:              0
  Total number of objects rebound:              0
  Total number of objects deleted:              0
  Total number of objects expired:            917
  Total number of objects failed:               0
  Total number of objects encrypted:            0
  Total snapshot difference objects:       38 678
  Total number of subfile objects:              0
  Total number of objects grew:                 0
  Total number of retries:                      0
  Total number of bytes inspected:            648  B
  Total number of bytes transferred:         7,54 GB
  Data transfer time:                    1 092,60 sec
  Network data transfer rate:            7 239,62 KB/sec
  Aggregate data transfer rate:          1 380,40 KB/sec
  Objects compressed by:                        0%
  Total data reduction ratio:                0,00%
  Subfile objects reduced by:                   0%
  Elapsed processing time:               01:35:30
  
  
  We see this line :
  "Total snapshot difference objects:       38 678"
  which means the client saw 38678 objects that changed as
  reported by the NetApp filer snapdiff feature.
  This number should be equal to what the Netapp "apitest" tool
  (available from NetApp SDK) would report as changed objects
  between the same filer volume snapshots (Base and differences
  snapshots) as used by the backup process.
  
  In reality, this is not the case.
  
  "Total snapshot difference objects" might report more objects
  than the "apitest" tool when directories containing more
  subdirectories and files are created.
  
  This is a cosmetic issue only and does not affect backup
  consistency.
  
  IBM Spectrum Protect Versions Affected:
  All supported IBM Spectrum Protect Client on AIX, Linux and
  Windows
  
  Initial Impact: Low
  
  Additional Keywords: tsm snapdiff diff difference summary
  statistic
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Backup-archive clients                                       *
  * -version 6.3, 6.4 and 7.1 running on Windows, AIX x64 and    *
  * Linux x86/86_64 platforms.                                   *
  * -version 8.1 running on Windows and Linux x86/86_64          *
  * platforms.                                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See ERROR DESCRIPTION                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * This issue is projected to be fixed in the Backup-Archive    *
  * Client:                                                      *
  * -version 7.1.8 on all Microsoft Windows, AIX x64 and Linux   *
  * x86/86_64 and                                                *
  * -version 8.1.2 on all Microsoft Windows and Linux x86/86_64  *
  * platforms.                                                   *
  * Note that this is subject to change at the discretion of     *
  * IBM.                                                         *
  ****************************************************************
  

Problem conclusion

• The issue in the calculation of snapshot difference objects in
  the case of a newly created or just fully removed folder has
  been fixed.
  Note that the calculation does not include objects having the
  change type 'inode_modification' whose contents have not been
  changed. For information about the 'inode_modification' see the
  NetApp documentation. You can use the auditlogging option to
  generate an audit log that contains an entry for each file that
  is processed during the snapshot differential backup.
  

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

  TSM CLIENT

• Fixed component ID

  5698ISMCL

Applicable component levels

• R71W PSY

     UP

• R71L PSY

     UP

• R71A PSY

     UP

• R81W PSY

     UP

• R81L PSY

     UP

• R81A PSY

     UP