Why SBS backup looks for the second media to continue since data to backup is ~22GB

Discussion in 'Windows Small Business Server' started by Yusuf Dilmen, Jun 22, 2005.

  1. Yusuf Dilmen

    Yusuf Dilmen Guest

    Why SBS backup looks for the second media to continue since data to backup
    is ~22GB. I cannot make it up to understand what's going on or nt backup is
    not using compression?

    Tape Drive:SEAGATE DAT 9SP40-000 SCSI Sequential Device

    6/21/2005 11:30 PM
    -------------------------------
    Date: 6/21/2005
    Time: 11:30 PM
    User: SYSTEM
    -------------------------------

    Backup Runner started.
    NTMS session started successfully.
    EnumerateNtmsObject(NTMS_LIBRARY) succeeded.
    Will enumerate on 3 media libraries found.
    GetNtmsObjectInformation(NtmsLibraryInfo) succeeded.
    GetNtmsObjectInformation(NtmsLibraryInfo) succeeded.
    GetNtmsObjectInformation(NtmsLibraryInfo) succeeded.
    Found an enabled library.
    InventoryNtmsLibrary(NtmsInventoryOmid) succeeded.
    Identify Media completed
    EnumerateNtmsObject(NTMS_PHYSICAL_MEDIA) succeeded.
    Will enumerate on 1 media types found.
    GetNtmsObjectInformation(NtmsPhysicalMediaInfo) succeeded.
    GetNtmsObjectInformation(NtmsMediaTypeInfo) succeeded.
    Found a tape media type in the library (4mm DDS).
    Launching NTBackup: ntbackup.exe backup "@D:\Program Files\Microsoft Windows
    Small Business Server\Backup\Small Business Backup Script.bks" /d "SBS
    Backup created on 6/21/2005 at 11:30 PM" /v:yes /r:no /rs:no /hc:eek:n /m
    normal /j "Small Business Server Backup Job" /l:s /p "4mm DDS" /UM
    NTBACKUP LOG FILE: C:\Documents and Settings\SBS Backup User.PCC\Local
    Settings\Application Data\Microsoft\Windows NT\NTBackup\data\backup02.log
    =====================<BEGIN NTBACKUP LOG FILE>=====================
    Backup Status
    Operation: Backup
    Active backup destination: 4mm DDS
    Media name: "Media created 6/21/2005 at 11:30 PM"

    Volume shadow copy creation: Attempt 1.
    Backup (via shadow copy) of "C: "
    Backup set #1 on media #1
    Backup description: "SBS Backup created on 6/21/2005 at 11:30 PM"
    Media name: "Media created 6/21/2005 at 11:30 PM"

    Backup Type: Normal

    Backup started on 6/21/2005 at 11:33 PM.
    Backup completed on 6/21/2005 at 11:55 PM.
    Directories: 3554
    Files: 29094
    Bytes: 4,559,031,689
    Time: 22 minutes and 33 seconds
    Backup (via shadow copy) of "D: New Volume"
    Backup set #2 on media #1
    Backup description: "SBS Backup created on 6/21/2005 at 11:30 PM"
    Media name: "Media created 6/21/2005 at 11:30 PM"

    Backup Type: Normal

    Backup started on 6/21/2005 at 11:55 PM.
    The requested media failed to mount. The operation was aborted.
    The operation was ended.
    Backup completed on 6/22/2005 at 1:53 AM.
    Directories: 2716
    Files: 31914
    Bytes: 14,260,612,151
    Time: 1 hour, 58 minutes, and 21 seconds

    ----------------------

    The operation did not successfully complete.

    ----------------------

    =======================<END NTBACKUP LOG FILE>=====================
    NTBackup finished the backup with errors.

    For more information about failed backups, see the article on
    troubleshooting your backup at the following Web page:
    http://go.microsoft.com/fwlink/?LinkId=18414

    Backup ended at Wednesday, June 22, 2005 1:54 AM
    Backup Runner finished.
     
    Yusuf Dilmen, Jun 22, 2005
    #1
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  2. backup is ~22GB. I cannot make it up to understand what's going on or nt
    backup is not using compression?
    Assuming that drive is DAT3 (ie 20/40), 22Gb is about all I'd expect to
    get on it, even with compression. You only get 2:1 compression (the ratio
    needed to get 40Gb on the tape) when all, or nearly all, your files are
    simple data files (eg lots of text files). With the mix of applications
    files, databases and data files you get on an SBS, I find it's rare to get
    a compression ratio higher than 1.1:1 (ie 10%), which leads to tape
    capacity of 20/22.
     
    Steve Foster [SBS MVP], Jun 22, 2005
    #2
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  3. Yusuf Dilmen

    slantnet Guest

    But The tape drive is Certance (Seagate) DAT TapeStor 40 - Tape drive - DAT
    20 GB / 40 GB - internal - SCSI ( STD2401LW-RY) tape drive and 20/240 GB DDS4
    150m Data Cartridge (certance CDM40).
    the thing that I do not understand is some of the days backup works just
    fine without any problem other days it fails (I think it cannot goto the
    verify state)

    I have same tape drive on the other machine and it work like a charm without
    any problem..
     
    slantnet, Jun 30, 2005
    #3
  4. If the amount of data being backed up is just on the limit of the tape
    (with compression), minor changes in what the users have stored will mean
    you're probably fipping back and forth between "fits" and "doesn't fit".

    So, sometimes it will fail because a second tape is needed, and sometimes
    it won't, because it fits on one tape.

    And what do you mean about "other machine"?
     
    Steve Foster [SBS MVP], Jun 30, 2005
    #4
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