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Indirect and Direct Library Access
Upon configuring Data Protector with a SCSI Library device, there are two ways in
which client systems can access library robotics: Indirect Library Access and Direct
Library Access.
Indirect Library Access
This configuration can be used in SAN as well as conventional SCSI direct connect
environments. Several systems can access the library robotics by forwarding their
requests to a client system that has direct access to the library robotics. This is called
Indirect Library Access. In the example depicted in Figure 54 on page 179, two client
systems are attached to an HP StorageWorks DLT multidrive library. The client system
castor controls the robotics and the first drive, while the client system pollux
controls the second drive. A Data Protector Media Agent on pollux communicates
with a process running on castor to operate the robotics. This Data Protector library
sharing feature is used automatically when the hostnames of the library and drive
are different.
Media management and devices178