HP B6960-96035 - Manual (Page 160)

Physical device collision
When specifying a device used for backup, you may specify one device name in
one backup specification and another device name of the same physical device in
a different backup specification. Depending on the backup schedule, this may result
in Data Protector trying to use the same physical device in several backup sessions
at the same time, thus creating a collision.
Preventing collision
To prevent this collision, specify a virtual lockname in both device configurations.
Data Protector checks if the devices have the same lockname and prevents collision.
For example, a DDS device is configured as a compressed device named DDS_C,
and as a non-compressed device DDS_NC as shown in
Figure 46 on page 160.
Specify the same lockname, DDS, for both devices.
Figure 46 Device locking and device names
Standalone devices
What are standalone devices?
Standalone devices are devices with one drive that reads/writes to one medium at
time.
Standalone devices are used for small scale backups or special backups. When the
medium is full, the operator must manually replace it with a new medium for the
backup to proceed.
Data Protector and standalone devices
Once you have connected a device to the system, you use the Data Protector user
interface to configure the device for use with Data Protector. To do this, you must first
Media management and devices 160