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

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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 number

    IT20346

  • Reported component name

    TSM CLIENT

  • Reported component ID

    5698ISMCL

  • Reported release

    71W

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-04-25

  • Closed date

    2017-05-19

  • Last modified date

    2017-05-19

  • 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



Document information

More support for: Tivoli Storage Manager

Software version: 71W

Reference #: IT20346

Modified date: 19 May 2017