Thanks.  But after I installed mtx for my Linux server and try label, it gave 
me different error:

*label
Automatically selected Catalog: MyCatalog
Using Catalog "MyCatalog"
Automatically selected Storage: LTO-2
Connecting to Storage daemon LTO-2 at cole:9103 ...
Enter new Volume name: testvol
Enter slot (0 or Enter for none): 
Defined Pools:
     1: Default
     2: File
     3: Scratch
Select the Pool (1-3): 1
Connecting to Storage daemon LTO-2 at cole:9103 ...
Sending label command for Volume "testvol" Slot 0 ...
Invalid slot=0 defined in catalog for Volume "" on "LTO-2-drive" (/dev/nst0). 
Manual load may be required.
3301 Issuing autochanger "loaded? drive 0" command.
3991 Bad autochanger "loaded? drive 0" command: ERR=Child exited with code 1.
Results=mtx: Request Sense: Long Report=yes
mtx: Request Sense: Valid Residual=no
mtx: Request Sense: Error Code=0 (Unknown?!)
mtx: Request Sense: Sense Key=No Sense
mtx: Request Sense: FileMark=no
mtx: Request Sense: EOM=no
mtx: Request Sense: ILI=no
mtx: Request Sense: Additional Sense Code = 00
mtx: Request Sense: Additional Sense Qualifier = 00
mtx: Request Sense: BPV=no
mtx: Request Sense: Error in CDB=no
mtx: Request Sense:3910 Unable to open device "LTO-2-drive" (/dev/nst0): 
ERR=dev.c:491 Unable to open device "LTO-2-drive" (/dev/nst0): ERR=No medium 
found

Label command failed for Volume testvol.
Do not forget to mount the drive!!!

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