IBM Support

IT35752: BACKUP OF POWERED OFF VMS SENDS MORE METADATA AND SHOWS THE TRANSPORT METHOD USED INSTEAD OF NONE

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APAR status

  • Closed as program error.

Error description

  • IBM Spectrum Protect for Virtual Environments Data Protection
    for VMware version 8.1.11 changes the way we process or examine
    changed block data for VM disks, this includes powered off VMs
    that have no changed blocks This results in all VM's showing
    the transport method used for the backup where as previously
    powered off VM's reported NONE. This release supports the
    ability of vSphere 6.7 and above to back up only allocated
    blocks which requires opening and processing metadata for all
    VM disks during the backup unlike previous versions.
    
    The
    following example shows a comparison between version 8.1.11 and
    older versions :
    
    <Time_Stamp> Processing snapshot
    disk:
    [DataStore] VM_NAME/VM_DISK.vmdk (Hard Disk 1)
    Capacity:
    53,687,091,200
    Data to Send: 0
    Transport: (hotadd)[sending)
    
    
    The daily backups also now send 7 MBs :
    
    <Time_Stamp> Total
    number of bytes transferred: 7.39 MB
    
    In previous versions
    prior to 8.1.11 :
    
    <Time_Stamp> Processing snapshot
    disk:
    [DataStore] VM_NAME/VM_DISK.vmdk (Hard Disk 1)
    Capacity:
    53,687,091,200
    Data to Send: 0
    Transport: none[sending]
    
    The
    daily backups used to send 30+ KB for this VM in the summary :
    
    
    <Time_Stamp> Total number of bytes transferred: 33.26 KB
    
    If
    there are no changed blocks for a disk the expected behavior
    would be that the disks should not be opened during the backup,
    in the summary there should be no data sent when a disk is not
    changed and the transport method should report NONE.
    
    This new
    feature is documented in the Data Protection for VMware version
    8.1.11 Updates link below :
    https://www.ibm.com/support/knowledg
    ecenter/en/SSERB6_8.1.11/ve.user/r_techchg_ve.html
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Data Protection for VMware version 8.1.11 running on all     *
    * Microsoft Windows x64 and Linux x86 platforms.               *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See ERROR DESCRIPTION                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * This issue is projected to be fixed in the Data Protection   *
    * for VMware Data Mover version 8.1.12 on Windows x64 and      *
    * Linux x86 platforms.                                         *
    * Note 1: This is subject to change at the discretion of IBM.  *
    ****************************************************************
    

Problem conclusion

  • Disk with no data are not opened and less metadata is sent for
    them.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT35752

  • Reported component name

    TSM FOR VE DP V

  • Reported component ID

    5725TVEVM

  • Reported release

    81W

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2021-02-01

  • Closed date

    2021-02-18

  • Last modified date

    2021-02-18

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

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

Modules/Macros

  • dsmagent
    

Fix information

  • Fixed component name

    TSM FOR VE DP V

  • Fixed component ID

    5725TVEVM

Applicable component levels

[{"Line of Business":{"code":"LOB26","label":"Storage"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SS8TDQ","label":"Tivoli Storage Manager for Virtual Environments"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"81W"}]

Document Information

Modified date:
26 February 2021