PowerProtect Data Manager 19.16 File System User Guide

BMR and SSR operations fail to run and a start_subscriber error appears in the agent-service log

A BMR or SSR operation might fail to display the start or completion of a job, and the DPSAPPS\AgetService log shows an error similar to msg_server.py-create_subscriber()Line 617 Exception occurred during start_subscriber Permission denied occurred.

This is caused when another service uses port 7010 or 7011.

Reconfigure any service that uses port 7010 or 7011 to use a different port.

Backing up BMR data fails with a ddfssv error

Backing up BMR data can fail with the error ddfssv FATAL <12128: Attempt to create a backup with no data is unsuccesful.

The Event Viewer system log might also contain an error similar to the following:

This is a known Microsoft issue that affects all backup products.

Retry the backup procedure after leaving more free space on the drive or when the drive is not as busy.

Disaster-recovery backups fail with a The system cannot find the file specified error

Disaster-recovery backups can fail with error messages similar to the following in the ddfssv log file:

2022-09-08T14:00:04.687Z [TRACE_ID:8815fbc662dd39f9;JOB_ID:af8c2587f740e6c4;EXEC_ID:a869d8aa1b7aaf57] ddfssv Error <5737>: I/O error: Unable to BackupRead(3) "C:\System Volume Information\EfaSIDat\SYMEFA.DB" (code 2: The system cannot find the file specified).
2022-09-08T14:00:04.687Z [TRACE_ID:8815fbc662dd39f9;JOB_ID:af8c2587f740e6c4;EXEC_ID:a869d8aa1b7aaf57] ddfssv Error <16507>: Path "C:\System Volume Information\EfaSIDat\SYMEFA.DB": Total processed bytes 0 is inconsistent with original data size 18087936
2022-09-08T14:00:12.499Z [TRACE_ID:8815fbc662dd39f9;JOB_ID:af8c2587f740e6c4;EXEC_ID:a869d8aa1b7aaf57] ddfssv Error <5137>: Unable to open 'C:\System Volume Information\EfaSIDat\SYMEFA_1.DB' for backup: code 5: Access is denied.

This can be caused by antivirus software preventing access to system files.

To resolve this issue, perform one of the following tasks:

• Use file exclusion:
  1. Exclude ddfssv.exe, ddfsrc.exe, ddfscon.exe, and restserver.exe from the antivirus software.
  2. Retry the disaster-recovery backup.
  3. Optionally, remove the files from the exclusion list.
• Temporarily disable the antivirus software:
  1. Disconnect the host from the network.
  2. Disable the antivirus software.
  3. Retry the disaster-recovery backup.
  4. Enable the antivirus software.
  5. Connect the host to the network.

Network connectivity issues after a BMR

A BMR can fail to recover network configuration information such as IP address, subnet mask, gateway, and DNS. If the recovered host experiences network connectivity issues, confirm its network configuration and make any necessary changes.

SSRs fail to restore a VSS writer

If an SSR fails to recover a VSS writer, you might see an error similar to the following:

ddfsrc Error <0000>: Unable to select W component from V for restore: The specified object was not found. (VSS error 0x80042308)

This occurs when writer .xml files are missing from the C:\Windows\Vss\Writers\System directory.

Restart the host, run the command vssadmin list writers to confirm the VSS writer status, and then retry the SSR.

BMR recovers critical volumes, but a disk is marked as offline

This can happen with disks that host Microsoft SQL Server instances.

Manually bring the disk online, and then restart the host.

SSRs show a RegSetValueEx() error and fail to recover files after a restart

An SSR might show Error <10958>: RegSetValueEx() for replace files, but complete successfully. After the host is restarted, certain files have not been recovered.

A file that is in use cannot be replaced by its recovered version. If you restart a host to have a file replaced but the file is not replaced, it might be because antivirus software is preventing access to the pendingfilerenameoperations registry key.

Perform one of the following tasks as a workaround.

• Use file exclusion:
  1. Retry the SSR, but do not restart the host.
  2. Exclude ddfssv.exe, ddfsrc.exe, ddfscon.exe, and restserver.exe from the antivirus software.
  3. Restart the host.
  4. Optionally, remove the files from the exclusion list.
• Temporarily disable the antivirus software:
  1. Retry the SSR, but do not restart the host.
  2. Disconnect the host from the network.
  3. Disable the antivirus software.
  4. Restart the host.
  5. Enable the antivirus software.
  6. Connect the host to the network.

BMR restore errors

Assigning volume letters or mount points failed.

Unable to do VSS restore: Bare metal recovery remount volumes step failed.

Perform the BMR restore again.

Cluster assets backup failure

Workaround is to run the cluster backup in a different policy and schedule.

BMR backup fails on EFI based system for a few times when backing up the BCD files

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2022-05-18T08:10:08.914Z [TRACE_ID:a559c76a1e886397;JOB_ID:9333c654df01e5af;EXEC_ID:af0c561e68d3aa75] ddfssv Info <0000>: Exported bcd file to temporary location
2022-05-18T08:10:08.920Z [TRACE_ID:a559c76a1e886397;JOB_ID:9333c654df01e5af;EXEC_ID:af0c561e68d3aa75] ddfssv Error <16507>: Path \\?\GLOBALROOT\Device\HarddiskVolume2\EFI\Microsoft\Boot\BCD: Total processed bytes 32768 is inconsistent with original data size xxxxx
2022-05-18T08:10:08.926Z [TRACE_ID:a559c76a1e886397;JOB_ID:9333c654df01e5af;EXEC_ID:af0c561e68d3aa75] ddfssv Error <16507>: Path \\?\GLOBALROOT\Device\HarddiskVolume2\EFI\Microsoft\Boot\BCD.LOG: Total processed bytes 32768 is inconsistent with original data size xxxxx
...

2022-05-18T10:51:25.078Z [TRACE_ID_a559c76a1e886397_EXEC_ID_af0c561e68d3aa75] ddfssv Info <6149>: Error summary: 2 errors: 16507(2)
2022-05-18T10:51:25.102Z [TRACE_ID_a559c76a1e886397_EXEC_ID_af0c561e68d3aa75] ddfssv Info <5314>: Command completed with exceptions (2 errors, exit code 10020: completed with errors, client log should be examined)
...
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IPv6 configuration fails in WinPE

When the user modifies the IPv6 address during the host configuration in the WinPE wizard, the system adds and lists all the IPv6 addresses rather than replacing the existing IPv6 address.

Workaround is to restart the restore process.

BMR fails with the message Unable to fetch parameters required for performing restore

If the BMR wizard fails with this message, and you have provided a username with the Restore Administrator role, ensure that the user account also has the User role.

Backup host is unregistered in PowerProtect Data Manager when the same FQDN and IP address are used in BMR

If the fully qualified domain name (FQDN) and IP address used in registering the backup host in PowerProtect Data Manager are used during bare-metal recovery (BMR) in the WinPE wizard, the registered backup host is unregistered after the BMR restore. Also, the same host is registered as a new one in PowerProtect Data Manager.

As a workaround, perform the following:

1. Unregister the new host from PowerProtect Data Manager using the unregister.bat file.
2. Reregister the backup host in PowerProtect Data Manager using the register.bat file.