Repeated Writing Of A Logical Volume Onto Tape; Creating A Directory - Fujitsu Siemens Computers pmn User Manual

Administering the tape cartridges

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.
LV0013
LV0008
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.
LV0024
Figure 11: Creating a directory on tape
36
LV0002
LV0011
LV0013
LV2008
CentricStor - Virtual Tape Library
LV0021
Directory
LV2413
U41117-J-Z125-7-76
PV0000
PV0001