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Data Protection Manager 2019 (DPM) General Purpose File Server Cluster Protection Failure

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Hi,

(See OUR PROBLEM, later below)

OUR CONFIG:

Our IT team has a Windows General Purpose File Server Cluster "ENGRFILER1" (active/passive) that is sharing a highly used volume (U: drive) which is 2 TB (915 GB currently in use).  The volume is NTFS with deduplication enabled at the file server level.  The file server cluster nodes are running Windows Server Core.

File server cluster node config (using MSINFO32):

     OS Name    Microsoft Windows Server 2019 Datacenter
     Version    10.0.17763 Build 17763
     Other OS Description     Not Available
     OS Manufacturer    Microsoft Corporation
     System Name    ENGR-FILER1N4
     System Manufacturer    Microsoft Corporation
     System Model    Virtual Machine
     System Type    x64-based PC
     System SKU    Not Available
     Processor    Intel(R) Xeon(R) Gold 6144 CPU @ 3.50GHz, 3492 Mhz, 3 Core(s), 6 Logical Processor(s)
     BIOS Version/Date    Microsoft Corporation Hyper-V UEFI Release v4.0, 3/13/2019
     SMBIOS Version    3.1
     BIOS Mode    Not Available
     BaseBoard Manufacturer    Microsoft Corporation
     BaseBoard Product    Virtual Machine
     BaseBoard Version    Hyper-V UEFI Release v4.0
     Platform Role    Not Available
     Secure Boot State    Not Available
     PCR7 Configuration    Not Available
     Windows Directory    C:\Windows
     System Directory    C:\Windows\system32
     Boot Device    \Device\HarddiskVolume2
     Locale    United States
     Hardware Abstraction Layer    Version = "10.0.17763.831"
     User Name    Not Available
     Time Zone    Eastern Daylight Time
     Installed Physical Memory (RAM)    Not Available
     Total Physical Memory    24.0 GB
     Available Physical Memory    11.4 GB
     Total Virtual Memory    27.5 GB
     Available Virtual Memory    11.8 GB
     Page File Space    3.50 GB
     Page File    C:\pagefile.sys
     Kernel DMA Protection    Off
     Virtualization-based security    Not enabled
     Device Encryption Support    Not Available
     A hypervisor has been detected. Features required for Hyper-V will not be displayed.    

( Note:  The file server cluster nodes are virtualized, running hyper-converged within a Storage Spaces Direct SOFS cluster.  The file server cluster node NTFS U: drive mounted volume share is actually a VHDX file inside a ReFS CSV on the storage spaces pool.  Deduplication is NOT enabled at the CSV S2D level. )

We have built a Microsoft Data Protection Manager 2019 server for backing up our file server volumes.

The DPM version is:  2019 - UR1 (10.19.260.0)

The DPM SQL Sever version info:

    SQL Server Management Studio                        15.0.18330.0
    SQL Server Management Objects (SMO)                        16.100.37971.0
    Microsoft Analysis Services Client Tools                        15.0.19040.0
    Microsoft Data Access Components (MDAC)                        10.0.17763.1
    Microsoft MSXML                        3.0 6.0
    Microsoft .NET Framework                        4.0.30319.42000
    Operating System                        10.0.17763

The server that DPM is running on is:  Windows Server 2019 Datacenter (1809, 17763.1131)

DPM sever config (MSINFO32):

    OS Name    Microsoft Windows Server 2019 Datacenter
    Version    10.0.17763 Build 17763
    Other OS Description     Not Available
    OS Manufacturer    Microsoft Corporation
    System Name    ENGR-BACKUP1
    System Manufacturer    Dell Inc.
    System Model    PowerEdge R610
    System Type    x64-based PC
    System SKU    Not Available
    Processor    Intel(R) Xeon(R) CPU           E5620  @ 2.40GHz, 2394 Mhz, 4 Core(s), 8 Logical Processor(s)
    Processor    Intel(R) Xeon(R) CPU           E5620  @ 2.40GHz, 2394 Mhz, 4 Core(s), 8 Logical Processor(s)
    BIOS Version/Date    Dell Inc. 6.1.0, 10/18/2011
    SMBIOS Version    2.6
    BIOS Mode    Not Available
    BaseBoard Manufacturer    Dell Inc.
    BaseBoard Product    0F0XJ6
    BaseBoard Version    A13
    Platform Role    Not Available
    Secure Boot State    Not Available
    PCR7 Configuration    Not Available
    Windows Directory    C:\Windows
    System Directory    C:\Windows\system32
    Boot Device    \Device\HarddiskVolume1
    Locale    United States
    Hardware Abstraction Layer    Version = "10.0.17763.1131"
    User Name    Not Available
    Time Zone    Eastern Daylight Time
    Installed Physical Memory (RAM)    Not Available
    Total Physical Memory    96.0 GB
    Available Physical Memory    90.2 GB
    Total Virtual Memory    110 GB
    Available Virtual Memory    103 GB
    Page File Space    14.0 GB
    Page File    C:\pagefile.sys
    Kernel DMA Protection    Off
    Virtualization-based security    Not enabled
    Device Encryption Support    Not Available
    Hyper-V - VM Monitor Mode Extensions    Yes
    Hyper-V - Second Level Address Translation Extensions    Yes
    Hyper-V - Virtualization Enabled in Firmware    No
    Hyper-V - Data Execution Protection    Yes

The DPM server has all patches and is up to date as of:  4/21/2020

The DPM server and file server cluster are members of our AD domain.

The DPM storage pool is:

   * 50 TB (25 TB currently free) on a 10 Gbit iSCSI connected SAN disk utilizing a SSD flash front-end tierd disk subsystem.

   * Formatted as "Modern Backup Storage" (MBS) ReFS without depduplication enabled.

The connectivity of the DPM server to the file server cluster is 10 Gbit throughout.

The above config is all BOG standard Microsoft DPM and storage config, out-of-the-box, vannilla stuff.

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

OUR PROBLEM

When we use DPM to backup the U: drive volume on our file sever cluster we are seeing the exact same problem as outlined in the following thread:

    https://social.technet.microsoft.com/Forums/en-US/52a4a412-3e78-447e-968a-3f2b291fc15b/fileserver-protection?forum=dpmfilebackup

The error message we have is:

U:\ on ENGRFILER1FS4.EngrFiler1.domain.x.y
   C:\Program Files\Microsoft System Center\DPM\DPM\Volumes\Replica\f553adae-8a21-403e-b5d1-9a1a5e0b1a31\5564c443-64e0-45ff-b8bb-1a4adec0bba2\Full\
DPM failed to clean up data of old incremental backups on the replica for Volume U:\ on ENGRFILER1FS4.EngrFiler1.domain.x.y.
Synchronization will fail until the replica cleanup succeeds.
(ID 30134 Details: Cannot create a file when that file already exists (0x800700B7))

This error message occurs every time we backup the volume.

For troubleshooting, we have rebuilt the entire DPM server from scratch and still get the same error.

For troubleshooting we have disabled Windows defender on the DPM server, and we do not run any other antivirus products, nor do we have defender enabled on our file server cluster nodes.

We have not had trouble with DPM when backing up our other servers for our IT environment.

We seem to only have trouble with the volumes exposed by our file server cluster.

Running a "synchronization job with consistency check" seems to fix the problem for a short time, then the problem will re-appear within a few hours, or a day.

I have a guess that this problem is somehow caused by the U: drive volume we are backing up is being deduplicated, but I can't confirm this, as others have stated that turning off dedup didn't solve their problem.

This page says a lot about running deduplication with the DPM storage pool, but it says very little (if anything at all that I can find) about the whether there will be problems when backing up when the volume being backed up is deduplicated:

    https://docs.microsoft.com/en-us/system-center/dpm/dpm-support-issues?view=sc-dpm-2019

The page needs more info for consumers if there are issues with backing up deduplicated volumes (on file server clusters or otherwise).

Any help would be greatly appreciated!

Thank you.


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