DFSR incremental backups running as full when TIR is enabled in policy

Article:TECH139878  |  Created: 2010-09-15  |  Updated: 2013-12-16  |  Article URL http://www.symantec.com/docs/TECH139878
Article Type
Technical Solution



Issue



DFSR incremental backups will run as full backups if TIR is enabled in the policy.

 


Error



BPBKAR log will report the following for ALL folders, including ones where the contents have not changed:

<4> dos_backup::tfs_include: INF - folder (User Data) has been created recently (since <date / time> ). It will be backed up in full.


Environment



Two or more Windows 2008 SP2 R2 x64 NetBackup client servers with DFSR replicated folders

Netbackup 6.5.6 on media server (any platform) and clients

Netbackup policy of type MS-Windows-NT
Backup selection = "Shadow Copy Components:\User Data\Distributed File System Replication\DfsrReplicatedFolders\"
TIR enabled in policy (with or without move detection)
Full and Cumulative Incremental backup schedules defined

'Time Overlap'  setting in Host Properties\Clients\Windows Client\Client Settings at default of 60 minutes

 


Cause



Limitations with DFSR VSS writer


Solution



TIR does not function for DFSR files and folders when backed up via Shadow Copy Components.   If incremental backups are required for DFSR folders, TIR needs to be disabled.

Additional note: Because DFSR backups do not create or utilize TIR information, synthetic full backups of a Shadow Copy Components stream may fail with a status 671.

 




Article URL http://www.symantec.com/docs/TECH139878


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