Fujitsu Siemens Computers CentricStor V3.1D, User Manual

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U41117-J-Z125-7-76
Administering the tape cartridges CentricStor - Virtual Tape Library
2.5.2 Repeated writing of a logical volume onto tape
If a logical volume which has already been saved onto tape is written to tape a second time
following an update, the first backup will be declared invalid. The current volume is
appended after the last volume of this tape or another tape with sufficient storage space.
Figure 10: Repeated writing of a logical volume onto tape
In the example above, the logical volume LV0013 on physical volume PV0000 is declared
invalid and is written anew to physical volume PV0001.
2.5.3 Creating a directory
After each write operation a directory is created at the end of the tape. This permits high-
speed data access during a later read/write operation.
Figure 11: Creating a directory on tape
LV0013
PV0000
PV0001
LV0011
LV0002
LV0021
LV0013
LV0008
T
ap
e h
ead
er
T
a
pe
he
a
de
r
LV2413
LV2008
T
a
p
e
-Head
er
LV0024
Co
n
te
n
ts
Directory