Tape library HP MSL G3 2024, 2 LTO 6250 drives, connected via LSI 9280-8e
Debian 8.2 
Bareos 14.2.1+20141017gitc6c5b56-3+deb8u1
mtx 1.3.12-9

lsscsi -g
[0:2:0:0]    disk    LSI      RAID SAS 6G 0/1  2.13  /dev/sda   /dev/sg0 
[7:1:27:0]   tape    HP       Ultrium 6-SCSI   338W  /dev/st0   /dev/sg1 
[7:1:28:0]   tape    HP       Ultrium 6-SCSI   338W  /dev/st1   /dev/sg2 
[7:1:28:1]   mediumx HP       MSL G3 Series    6.10  /dev/sch0  /dev/sg3

bareos-sd config:

Autochanger {
  Name = MSL2024
  Device = Drive-0
  Device = Drive-1
  Changer Command = "/usr/lib/bareos/scripts/mtx-changer %c %o %S %a %d"
  Changer Device = /dev/sg3
}

Device {
  Name = Drive-0
  Media Type = LTO-6
  Archive Device = /dev/st0
  AutomaticMount = yes;               # when device opened, read it
  AlwaysOpen = yes
  AutoChanger = yes
  Maximum Concurrent Jobs = 1
  Drive Index = 0
  Maximum Changer Wait = 180
}

Device {
  Name = Drive-1
  Media Type = LTO-6
  Archive Device = /dev/st1
  AutomaticMount = yes               # when device opened, read it
  AlwaysOpen = yes
  AutoChanger = yes
  Maximum Concurrent Jobs = 1
  Drive Index = 1
  Maximum Changer Wait = 180
}


root@hq-bareos-01:~# /usr/lib/bareos/scripts/mtx-changer /dev/sg3 listall 
/dev/st0 0                                                                      
                                                                                
                                       
D:0:E
D:1:E
S:1:F:AIK282L6                       
S:2:E
S:3:E
S:4:E
S:5:E
S:6:E
S:7:E
S:8:E
S:9:E
S:10:E
S:11:E
S:12:E
S:13:E
S:14:E
S:15:E
S:16:E
S:17:E
S:18:E
S:19:E
S:20:E
S:21:E
S:22:E
S:23:E
I:24:F:CLNU02L1                       
root@hq-bareos-01:~# /usr/lib/bareos/scripts/mtx-changer /dev/sg3 load 1 
/dev/st0 0                                                                      
                                                                                
                                        
Loading media from Storage Element 1 into drive 0...mtx: Request Sense: Long 
Report=yes
mtx: Request Sense: Valid Residual=no
mtx: Request Sense: Error Code=70 (Current)
mtx: Request Sense: Sense Key=Unit Attention
mtx: Request Sense: FileMark=no
mtx: Request Sense: EOM=no
mtx: Request Sense: ILI=no
mtx: Request Sense: Additional Sense Code = 29
mtx: Request Sense: Additional Sense Qualifier = 02
mtx: Request Sense: BPV=no
mtx: Request Sense: Error in CDB=no
mtx: Request Sense: SKSV=no
MOVE MEDIUM from Element Address 1001 to 1 Failed
root@hq-bareos-01:~# /usr/lib/bareos/scripts/mtx-changer /dev/sg3 listall 
/dev/st0 0                                                                      
                                                                                
                                       
D:0:F:1:AIK282L6                       
D:1:E
S:1:E
S:2:E
S:3:E
S:4:E
S:5:E
S:6:E
S:7:E
S:8:E
S:9:E
S:10:E
S:11:E
S:12:E
S:13:E
S:14:E
S:15:E
S:16:E
S:17:E
S:18:E
S:19:E
S:20:E
S:21:E
S:22:E
S:23:E
I:24:F:CLNU02L1                       
root@hq-bareos-01:~# btape Drive-0
Tape block granularity is 1024 bytes.
btape: butil.c:301-0 Using device: "Drive-0" for writing.
btape: btape.c:480-0 open device "Drive-0" (/dev/st0): OK
*status
 Bareos status: file=0 block=0
 Device status: BOT ONLINE IM_REP_EN file=0 block=0
btape: btape.c:2149-0 Device status: 645. ERR=
*
*autochanger

Ah, I see you have an autochanger configured.
To test the autochanger you must have a blank tape
 that I can write on in Slot 1.

Do you wish to continue with the Autochanger test? (y/n): y


=== Autochanger test ===

3301 Issuing autochanger "loaded" command.
Slot 1 loaded. I am going to unload it.
3302 Issuing autochanger "unload 1 0" command.
unload status=Bad 268435457
3992 Bad autochanger command: /usr/lib/bareos/scripts/mtx-changer /dev/sg3 
unload 1 /dev/st0 0
3992 result="Unloading drive 0 into Storage Element 1...mtx: Request Sense: 
Long Report=yes
": ERR=Child exited with code 1
3303 Issuing autochanger "load 1 0" command.
3993 Bad autochanger command: /usr/lib/bareos/scripts/mtx-changer /dev/sg3 load 
1 /dev/st0 0
3993 result="Loading media from Storage Element 1 into drive 0...mtx: Request 
Sense: Long Report=yes
": ERR=Child exited with code 1
You must correct this error or the Autochanger will not work.
*

how to make it work?

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