release notes | Book: 1.9.5, 1.9.12 (opt, FHS), 2.11 (FHS), 2.12 (FHS), 2.13 (FHS), 2.14 (FHS), | Wiki | Q&A black_bg
Web: Multi-page, Single page | PDF: A4-size, Letter-size | eBook: epub black_bg

Chapter 6. Resilience with the Replica Manager

Alex Kulyavtsev


Mathias de Riese


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 replica manager 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 4 or more replicas exist, some of them will be deleted.