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replica service (which is also referred to as Replica
Manager) controls the number of replicas of a file on the pools.
If no tertiary storage
system is connected to a dCache instance (i.e., it
is configured as a large file
store), there might be only one copy of each file on
disk. (At least the precious
replica.) If a higher security and/or availability is
required, the resilience feature of dCache can be used: If
running in the default configuration, the
will make sure that the number of replicas of a file will be at
least 2 and not more than 3. If only one replica is present it
will be copied to another pool by a pool to pool transfer. If four or more
replicas exist, some of them will be deleted.