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Figure 55 Direct Library Access
Device sharing in clusters
Clustering, which is often used in combination with the SAN concept, is based on
sharing network resources (for example network names, disks, and tapes devices)
between nodes.
Cluster-aware applications can at any time run on any node in a cluster (they run on
virtual hosts). To perform a local backup of such an application, you need to configure
devices with virtual hostnames instead of real node names. Configure as many devices
for each physical device as you need, using the Lock Name device locking
mechanism. For details, see “Device locking” on page 177.
Static drives
Static drives are devices that are configured on a real node in a cluster. They can
be used to back up data from systems with disks that are not shared. However, they
are not useful for backing up cluster-aware applications, because such application
can run on any node in the cluster.
Media management and devices180