Tape Compression for Protection Groups Not Working

Hi everyone,
We've since started using DPM 2012 R2 to backup our systems. Everything is working except for tape compression. I've read some other discussions regarding similar issues, but none have been of any help to me.
DPM (version 4.2.1254.0) is running on a physical server (HP BL460c G6) running Windows Server 2008 R2 Enterprise SP1. Microsoft SQL Server 2008 R2 is also running on the same machine providing the database for DPM. Other roles installed: Hyper-V, WDS,
WSUS, IIS, and File Services. The tape drive is an HP StorageWorks SB1760c which is partnered to the blade server in a C3000 chassis. Tapes are LTO-4. Everything is fully patched from Windows Updates.
The backup starts off fine, but because the tape drive is a not an auto-loader, the backup fails because it is waiting for a new tape to be inserted so it can complete the backup. If DPM would compress the data, it will all fit on the one tape.
So far, I've:
Reinstalled the operating system and all the server roles on it (twice!).
Used HP's Library and Tape Tools to perform a tape compression test (which passes - the results did show that the data written during the test was compressed).
Reviewed other similar discussions.
None of which have been of any use. To start off, I would like to look at the logs produced during the backup to see if there is anything useful in them. Can someone please direct me to where they may be?
Any help with this problem would be greatly appreciated. I quite like DPM over the competition, it's just this one problem causing me grief.

Hi
You can enable DPM Verbose logging, then manually start a tape backup of a datasource that is in a protection group that has tape compression option checked. Once the backup starts writing data to the drive, you can open a command prompt and CD to
the DPM log location and run the following command.
    Find /i "TapeInfo DriveAccessPath=" msdpm*.errlog
It should show that the MTASetMedia command set the block size to 65536, and HWcompression to true on the drive we're writing to.
[Example showing HWCompression was set to true]
VERBOSE       <TapeInfo DriveAccessPath="\\.\Tape2147483645" PhysicalBlockSize="65536"
HWCompression="true" xmlns="http://schemas.microsoft.com/2003/dls/MediaManager/StorageXMLSchema.xsd" />
VERBOSE CMTATapeInfo::InitializeFromDOM => m_ssDrivePath = [\\.\Tape2147483645] m_dwPhysicalBlockSize = [65536]
m_bHWCompression = [1]
If you see that, then DPM did it's job and it's up to the tape drive to honor the request and compress data as written.
If you keep the verbose logging on for the duration of the tape backup jobs, it should detail switching tapes as well, so you can take a look and see if you can figure out why we changed media when we did. If you search for "EOM hit: 1"
that means we hit end of media.
To enable full VERBOSE logging, under HKLM\Software\Microsoft\Microsoft Data Protection Manager, add a DWORD value named TraceLogLevel and set it to 0x43e, then stop and restart the msdpm and dpmra services.   The DPM log files will now contain
MUCH MORE logging to help troubleshoot issues without requiring a DPM trace.
DPM 2010 or upgrade to DPM 2012 the Logs are in the C:\program files\Microsoft DPM\DPM\temp folder
DPM 2012 (clean install) logs are in the C:\program Files\System Center 2012\DPM\DPM\temp folder.
After you reproduce the problem, be sure delete or rename the TraceLogLevel registry setting and restart the DPM services so normal (non-Verbose) logging resumes.
SAMPLE OUTPUT DPM2012 SP1
C:\Program Files\Microsoft DPM\DPM\Temp>find /i "tapeinfo" *.errlog
---------- DPMRA56.ERRLOG
165C    0C80    06/14   16:32:26.771    05      defaultsubtask.cpp(527) [0000000000370750]      40292CEC-FBEE-4D6A-9763-031FB711A480    VERBOSE
<TapeInfo DriveAccessPath="\\.\Tape2147483645" PhysicalBlockSize="65536"
HWCompression="true" xmlns="http://schemas.microsoft.com/2003/dls/MediaManager/StorageXMLSchema.xsd" />
165C    0C80    06/14   16:32:26.771    29      mtastoragexml.cpp(28)   [0000000003F77AA0]      40292CEC-FBEE-4D6A-9763-031FB711A480
VERBOSE ==>CMTATapeInfo::CMTATapeInfo
165C    0C80    06/14   16:32:26.771    29      mtastoragexml.cpp(28)   [0000000003F77AA0]      40292CEC-FBEE-4D6A-9763-031FB711A480
VERBOSE <--CMTATapeInfo::CMTATapeInfo
165C    0C80    06/14   16:32:26.771    29      mtastoragexml.cpp(68)   [0000000003F77AA0]      40292CEC-FBEE-4D6A-9763-031FB711A480
VERBOSE CMTATapeInfo::InitializeFromDOM => m_ssDrivePath = [\\.\Tape2147483645] m_dwPhysicalBlockSize = [65536]
m_bHWCompression = [1]
165C    0C80    06/14   16:32:26.771    29      mtastoragexml.cpp(42)   [0000000001F2F340]      40292CEC-FBEE-4D6A-9763-031FB711A480
VERBOSE ==>CMTATapeInfo::~CMTATapeInfo
165C    0C80    06/14   16:32:26.771    29      mtastoragexml.cpp(42)   [0000000001F2F340]      40292CEC-FBEE-4D6A-9763-031FB711A480
VERBOSE <--CMTATapeInfo::~CMTATapeInfo
165C    0C80    06/14   16:32:26.771    29      mtastoragexml.cpp(42)   [0000000003F77AA0]      40292CEC-FBEE-4D6A-9763-031FB711A480
VERBOSE ==>CMTATapeInfo::~CMTATapeInfo
165C    0C80    06/14   16:32:26.771    29      mtastoragexml.cpp(42)   [0000000003F77AA0]      40292CEC-FBEE-4D6A-9763-031FB711A480
VERBOSE <--CMTATapeInfo::~CMTATapeInfo
---------- MSDPMCURR.ERRLOG
18DC    1B80    06/14   16:32:26.756    01      TaskInstance.cs(1034)           40292CEC-FBEE-4D6A-9763-031FB711A480
VERBOSE       <TapeInfo DriveAccessPath="\\.\Tape2147483645" PhysicalBlockSize="
65536" HWCompression="true" xmlns="http://schemas.microsoft.com/2003/dls/MediaManager/StorageXMLSchema.xsd" />
18DC    0574    06/14   16:32:26.756    04      cmdproc.cpp(2432)       [0000000003B8A470]      40292CEC-FBEE-4D6A-9763-031FB711A480
VERBOSE       <TapeInfo DriveAccessPath="\\.\Tape2147483645" PhysicalBlockSize="65536" HWCompression="true"
xmlns="http://schemas.microsoft.com/2003/dls/MediaManager/StorageXMLSchema.xsd" />
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT] This
posting is provided "AS IS" with no warranties, and confers no rights.

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