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Partitions and Links

A partition, so far, is just a set of parameters which may or may not differ from the default set. To let a partition relate to a part of the dCache, links are used. Each link may be assigned to exactly one partition. If not set, or the assigned partition doesn’t exist, the link defaults to the default partition.

psu set link [<linkName>] -section=<partitionName> [<other-options>...]

Whenever this link is chosen for pool selection, the associated parameters of the assigned partition will become active for further processing.


Depending on the way links are setup it may very well happen that more than just one link is triggered for a particular dCache request. This is not illegal but leads to an ambiguity in selecting an appropriate dCache partition. If only one of the selected links has a partition assigned, this partition is chosen. Otherwise, if different links point to different partitions, the result is indeterminate. This issue is not yet solved and we recommend to clean up the poolmanager configuration to eliminate links with the same preferences for the same type of requests.