[Veritas-bu] Please help me with tape drive issues.....

NBU 7.5.0.4 master
NBU 7.5.0.4 media 
Master is Solaris 10
Media is Linux Rel 5.5 64-bit
ACSLS 7.2 on Solaris 10
Tape library is a STK SL8500, 12,000 slots, 64 drives. Many drives are T10KB 
drives. 4 robots in this library. Library is shared between 3 masters.

We are experiencing MANY drive down issues.
This is from one media server:
00:11:30.586 [16828] <6> WriteEntry: Updating drive 0158.T1BE.0-1-1-05.B43 at 
path /dev/nst18 on attach host
00:13:45.790 [16828] <6> WriteEntry: Updating drive 0158.T1BE.0-1-1-07.B35 at 
path /dev/nst17 on attach host
00:13:45.827 [16828] <16> update_drive: (0) UpdateDrive failed, emmError = 
2006002, nbError = 0
00:13:45.827 [16828] <16> WriteEntry: (-) Translating 
EMM_ERROR_NotScanHost(2006002) to 304 in the device management context
00:13:45.827 [16828] <3> logstderrmsg: emmlib_UpdateDriveRuntime failed, 
status=304
00:20:24.256 [16828] <4> LtidProcCmd: Pid=1897, Data.Pid=1897, Type=89, 
Param1=3, Param2=0, LongParam=0
00:20:24.256 [16828] <4> OprSetLocalScanHostByPath: CLEAR SCAN HOST for drive 
0158.T1BE.0-1-1-05.B43 - < 0x10190 >
00:20:24.256 [16828] <4> OprSetLocalScanHostByPath: Drive 
0158.T1BE.0-1-1-05.B43 has stopped scanning - < 0x80000090 >
00:20:31.263 [16828] <6> WriteEntry: Updating drive 0158.T1BE.0-1-1-05.B43 at 
path /dev/nst18 on attach host
00:21:12.369 [16828] <4> LtidProcCmd: Pid=1897, Data.Pid=1897, Type=89, 
Param1=18, Param2=1, LongParam=0
00:21:12.369 [16828] <4> OprSetLocalScanHostByPath: SET SCAN HOST for drive 
0158.T1BE.0-2-1-02.B24 - < 0x90 >
00:21:12.369 [16828] <4> OprSetLocalScanHostByPath: Changed Path to 
/dev/nst16(epsdb01) and set scan host to local for 0158.T1BE.0-2-1-02.B24 - < 
0x80000190 >
00:21:13.369 [16828] <4> LtidProcCmd: Pid=1897, Data.Pid=1897, Type=89, 
Param1=18, Param2=0, LongParam=0
00:21:13.369 [16828] <4> OprSetLocalScanHostByPath: CLEAR SCAN HOST for drive 
0158.T1BE.0-2-1-02.B24 - < 0x80000190 >
00:21:13.369 [16828] <4> OprSetLocalScanHostByPath: Drive 
0158.T1BE.0-2-1-02.B24 has stopped scanning - < 0x80000090 >
00:21:16.372 [16828] <6> WriteEntry: Updating drive 0158.T1BE.0-3-1-10.B06 at 
path /dev/nst7 on attach host
00:21:16.410 [16828] <16> update_drive: (0) UpdateDrive failed, emmError = 
2006002, nbError = 0
00:21:16.410 [16828] <16> WriteEntry: (-) Translating 
EMM_ERROR_NotScanHost(2006002) to 304 in the device management context


We also have Encryption in place and we are fighting many issues with 
RC=84/85/86. Most of what NBU says in the logs is "header block" 
issue.......How can we have header block issues on over 600 tapes?

Please advise?

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