关于看槽位的理解：
最近在 tsm 的虚拟带库上建了两个库，有发现：
TSM:TSM_SVR1>
show slots vtl01
ANR2017I Administrator SERVER_CONSOLE issued command: show slots vtl01
PVR slot information for library VTL01.
Library : VTL01
Product Id : Scalar i500
Support module : 2
Mount count : 0
Drives : 4
Slots : 4
Changers : 1
Import/Exports : 0
Device : /dev/tsmscsi/lb0
Drive 0, element 2051
Drive 1, element 2052
Drive 2, element 2053
Drive 3, element 2054
Changer 0, element 0
Slot 0, status Allocated, element number 1, barcode not present, barcode value <>, devT=ANY,
mediaT=-1, elemT=ANY
Slot 1, status Allocated, element number 2, barcode not present, barcode value <>, devT=ANY,
mediaT=-1, elemT=ANY
Slot 2, status Allocated, element number 3, barcode not present, barcode value <>, devT=ANY,
mediaT=-1, elemT=ANY
Slot 3, status Full, element number 4, barcode not present, barcode value <>, devT=ANY, mediaT=-1,
elemT=ANY
slot element range 1 - 4
发现上面slot3 和slot 0,1,2 的状态不一样，就是说一共4个槽位，vtl01 带库就占了3 个，
再结合：
看带库中的磁带：
TSM:TSM_SVR1>
q libv
ANR2017I Administrator SERVER_CONSOLE issued command: QUERY LIBVOLUME
Library Name Volume Name Status Owner Last Use Home Device
Element Type
------------ ----------- ---------------- ---------- --------- ------- ------
VTL01 AD0001 Private Data 1
VTL01 AD0002 Private 2
VTL01 AD0003 Private 3
VTL02 AD0004 Scratch 4
发现：vtl01 是占了3 个， vtl02 是只有一个：
再看一下 vtl02 的情况：
TSM:TSM_SVR1>
show slots vtl02
ANR2017I Administrator SERVER_CONSOLE issued command: show slots vtl02
PVR slot information for library VTL02.
Library : VTL02
Product Id : Scalar i500
Support module : 2
Mount count : 0
Drives : 4
Slots : 4
Changers : 1
Import/Exports : 0
Device : /dev/tsmscsi/lb0
Drive 0, element 2051
Drive 1, element 2052
Drive 2, element 2053
Drive 3, element 2054
Changer 0, element 0
Slot 0, status Full, element number 1, barcode not present, barcode value <>, devT=ANY, mediaT=-1,
elemT=ANY
Slot 1, status Full, element number 2, barcode not present, barcode value <>, devT=ANY, mediaT=-1,
elemT=ANY
Slot 2, status Full, element number 3, barcode not present, barcode value <>, devT=ANY, mediaT=-1,
elemT=ANY
Slot 3, status Allocated, element number 4, barcode not present, barcode value <>, devT=ANY,
mediaT=-1, elemT=ANY
slot element range 1 - 4
发现vt02 是占了第四个槽位。
还有就是会发现
tsm:> q v 和tsm:> q libv 的磁带看到的不一样：
TSM:TSM_SVR1>
q libv
ANR2017I Administrator SERVER_CONSOLE issued command: QUERY LIBVOLUME
Library Name Volume Name Status Owner Last Use Home Device
Element Type
------------ ----------- ---------------- ---------- --------- ------- ------
VTL01 AD0001 Private Data 1
VTL01 AD0002 Private 2
VTL01 AD0003 Private 3
VTL02 AD0004 Scratch 4
TSM:TSM_SVR1>
Storage Management Server for Linux/i386 - Version 5, Release 5, Level 1.0
TSM:TSM_SVR1>
q v
ANR2017I Administrator SERVER_CONSOLE issued command: QUERY VOLUME
Volume Name Storage Device Estimated Pct Volume
Pool Name Class Name Capacity Util Status
------------------------ ----------- ---------- --------- ----- --------
/opt/tivoli/tsm/server/- ARCHIVEPOOL DISK 5.0 M 0.0 On-Line
bin/archive.dsm
/opt/tivoli/tsm/server/- BACKUPPOOL DISK 10.0 M 0.0 On-Line
bin/backup.dsm
AD0001 BA_TAPE_PO- LTO2 1.0 G 0.8 Filling
OL
AD0002 BA_TAPE_PO- LTO2 0.0 M 0.0 Empty
OL
AD0003 AR_TAPE_PO- LTO2 0.0 M 0.0 Empty
OL
AS0001 BA_T_POOL LTO3 0.0 M 0.0 Empty
AS0004 BA_T_POOL LTO3 0.0 M 0.0 Empty
TT0003 AR_TAPE_PO- LTO2 0.0 M 0.0 Empty
OL
TT0004 AR_TAPE_PO- LTO2 0.0 M 0.0 Empty
OL
发现只有贴了标签的磁带：就是被label 过的才是进带库的。
才是可用的。
q v 看到的是进入 spool 池的磁带，很多是不能用的。会报can not access 的。