Hi … today we are going to discuss some of the problems you might face while tacking backup using DPM 2012 on tape library..
First error I faced not too long ago is access denied error
Error: The operation failed because of a protection agent failure. ID 998 Details: Access is denied (0x80070005)
After Some investigation I figured it out it was Driver issue
after updating all the tape drives driver to the native Windows LTO tape drivers
After doing this its working perfectly…
second error you might face is due to timeout
The operation failed because of a protection agent failure. (ID 998 Details: The semaphore timeout period has expired (0x80070079))
There is support article I found for this issue http://support.microsoft.com/kb/170359.
to resolve it added a DWORD in Registry in this path on your DPM server…
Value Name: TcpMaxDataRetransmissions
Data Type: REG_DWORD – Number
Valid Range: 0 – 0xFFFFFFFF
Set TcpMaxDataRetransmissions to 10
Now, Backup will work fine…