BackBox H4.00 User Manual

Configuration
36 BackBox H4.00 User Manual
• The VT Controller (or VTC) defines the virtual devices, TCPIP and
SCSI/FC connections to the NonStop are specified.
• The Data Store describes where the virtual volume images are
stored.
• The Volume Groups set volume attributes such as the maximum
volume size, the type volume and corresponding NonStop catalog
and pool.
Domain
A domain is the definition of an operational environment for tape applications. It is
defined by a catalog of virtual tape volumes and a set of configuration for the VTCs
and other entities named above.
In the configuration, the Domain entity gathers the global settings. Its main property
is the Domain name, or Domain ID, chosen by the user. Among a few other uses,
this domain ID is included in the prefix of all EMS messages generated by the
domain.
VTCs and Virtual Devices
The VTC configuration defines the VTC servers present in the Domain and associates
some or all of the available SCSI/FC connections to virtual tape drives in NonStop
systems.
Each available physical SCSI/FC connection to the VTC is presented as a port in the
VTC configuration page.
Configuring several virtual devices on the same port:
Allows more tape applications to run concurrently.
Maximizes the usage of the available FC bus bandwidth.
Data Stores
A Data Store is a data repository for a set of virtual tape volumes.
To configure a Data Store in a Domain, an area of storage and routes to the storage
must be defined. The routes establish through which VTCs, hence which tape drives,
a given storage area can be reached. The whole data storage must be available to
all routes of the Data Store; for a WINDISK Data Store all paths configured in the
disk pool must be reachable by all VTCs defined as routes.
Volume Groups
A Volume Group is a group of volumes that share the same set of attributes: