I just stood up my first DPM server running 1801 on a VMware VM, the OS is Server 2016 and SQL 2016 is installed locally. After adding a SAN drive for short term protection, I added a DR4100 dedup appliance as a Virtual Tape Library using the instructions found in the PDF that is linked below.
http://support-public.cfm.quest.com/37814_Microsoft_DPM_-_Setting_Up_the_Dell_DR_Series_System_as_a_VTL_Backup_Target_on_Microsoft_Data_Protection_Manager.pdf
Backups to the VTL have been working perfectly until I tried to back up a 5TB folder on a Server 2012 R2 VM. I have tried to create a recovery point 3 times and each time it fails after transferring 2.04TBs of data. I have pasted the error shown in the console below and it is followed 8 hours later by a "DPM failed to write to tape because the tape is write-protected. (ID 30104 Details: The media is write protected (0x80070013))" error, not sure if this second error is related. Anybody seen this before?
Type:Tape backupStatus:Failed
Description:DPM encountered a critical error while performing an I/O operation on the tape 6th of every Month 11pm Protection Group-LT-1Months-Copy0-00000010 (Z6P8Z501J) (Barcode - Z6P8Z501J) in Drive IBM ULTRIUM 4 3580 TAPE DRIVE (Z6P8Z5_09). (ID 30101 Details: Data error (cyclic redundancy check) (0x80070017))
More information
End time:4/4/2018 5:05:56 PM
Start time:4/4/2018 8:22:57 AM
Time elapsed:08:42:58
Data transferred:2,041,727.19 MB
Cluster node-
Source details:M:\
Protection group:6th of every Month 11pm Protection Group
Library:Sun/StorageTek Library
Tape Label (Barcode):6th of every Month 11pm Protection Group-LT-1Months-Copy0-00000010 (Z6P8Z501J)
6th of every Month 11pm Protection Group-LT-1Months-Copy0-00000009 (Z6P8Z501K)
6th of every Month 11pm Protection Group-LT-1Months-Copy0-00000008 (Z6P8Z501L)