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ADIC/GRAU DAS and STK ACS Libraries
ADIC/GRAU DAS and STK ACS Integrations
Chapter 14 659
Configuration Basics
When considering your environment and the configuration that is best
for you, keep in mind that there are two ways to configure the
ADIC/GRAU and STK ACS libraries with Data Protector: where each
client accesses the library directly (direct access to the library), or where
each client is connected to one system that controls the library robotics
through the server (indirect access to the library). Regardless of the
configuration you choose, direct or indirect, the DAS or ACS Media
Agent software has to be installed on each client that directly or
indirectly accesses the library robotics. For the ADIC/GRAU integration,
each system on which you install the DAS Media Agent software is called
a DAS Client. For the STK ACS integration, each system on which you
install the ACS Media Agent software is called an ACS Client.
Choosing the Direct or Indirect Library Access Configuration
The direct library access configuration is recommended and, with
previous versions of Data Protector, it was the only possible
configuration. When either DAS or ACS Client has direct access to the
library, there is no chance of single point of failure. That is, with the
indirect access configuration, if the client with direct access to the library
fails, all the clients that access the library through that system also lose
access to the library.
Media Management Basics
In the ADIC/GRAU DAS and STK ACS library devices, the size of the
repository with media depends on your license. A medium is identified by
its volume serial number, or volser. The volser, similar to a barcode,
uniquely identifies each medium during its life.
Media in the library can be used by many applications, not just by Data
Protector, so that you have to know which applications use which media
to prevent them from being overwritten.
Ideally, you will use the ADIC/GRAU or ACS library with Data Protector
exclusively and let Data Protector manage the complete library, but if
you have other applications using the library, you should take care to
assign non-intersecting subsets of media to Data Protector and other
applications. Also, note that Data Protector does not make use of scratch
pools but maintains its own independent media allocation policy. This
implies that if a specific medium has been allocated to Data Protector