due to huge volume size backup fails with code 13

Hello Everyone,

We have a windwos 2008 -  file server with 8 A,B,C,E..etc.,drives,

Netbackup client version is 7.1 / Netbackup master/media version - Solaris 10 - 7.6.0.1 / Storage Target  - DataDomain

We have multistreaming enabled.

Incrmental backup completes successfully for this file server.

However whenever full backup runs, 2 drives always fail with code 13, 24. 

These 2 drives size is around 2TB.

 I have selected file read timeout to 3600, still no use.

Kindly advise if  i need to disable "windows open file backup"