User's Manual

HP StorageWorks File System Extender Software user guide 141
• Logical resources:
• FSE media cartridges, each medium includes FSE medium volumes
• FSE media pools
The figure below schematically shows the resources as they are represented in the FSE implementation
Figure 28 Example of FSE resources
Central FSE resource manager
All resources of the FSE implementation are controlled by a central Resource Manager. It manages the
Resource Management Database and allocates resources. Resource allocation is used each time an FSE
job requires new resources. Typically, the Resource Manager locks the use of resources in the Resource
Management Database for jobs that have requested allocation.
Media selection by media location
Allocation selects a medium according to its location. Possible locations of a medium are:
• Online: Medium is loaded into a drive.
• Nearline: Medium is in a library slot.
• Offline: Medium location is unknown.
The Resource Manager always allocates media and drives that are in the same library first to avoid
time-intensive load/unload operations. If there are still jobs in the queue and no online media are
available, then nearline media are selected.
Whenever possible, the current volume from an allocated medium is used. Otherwise, the volume with the
highest use is selected to minimize the number of open volumes.
Several allocation parameters
There is only one Resource Manager for the whole FSE implementation, and therefore it is responsible for
all FSE partitions. The parameters needed for resource allocation are different for the whole FSE
implementation (system) and each partition; they are defined in the systems policies and in the partitions
policies.