hi,

just try inventory once and make sure all library contents are updated, and check again..

if you still have the issue, we may need to look into barcode rules and media lables.

Hi

However, it does not happen on Virtual tape library(VTL) even the OS is windows 2008 R2 and without inventory 

It only happen on windows 2008 R2 with physical tape drive or library. The workaround solution is bpdown and bpup on media server.  

yes, you may not see this on VLT becuase thier we dont have tape rotation .. 

but in Physical, ther is always tape rotation which needs to update though Inventory to EMM servers, about the latest contensts of library 

Hi,

But, how to explain it did not happen on windows 2003 server with physical tape driver?

Even i use barcode to recognize the media label in Tape Library model TS2900 (ibm product), this same problem also happened.

first we need to sort out the current issue with win2008 R2 servers, then we can see what are the things differently happenig with the 2003 servers

did you get chage to do the inventary and test the backups?

The different between the windows 2003 and Windows 2008 R2 are the tape drivers.

In windows 2003 the tape driver are downloaded from ibm

In windows 2008 the tape driver are come with OS

I mentioned in my real case, the tape library model TS2900 have done the inventory before backup. However, the frozen action will happen on it

I agree with Mark - Symantec recommends that manufacturer's drivers be used.

Extract from HCL:

For 64-bit Windows systems, the manufacturer's most recent tape driver should be used.