| Issue |
EPJ Web Conf.
Volume 337, 2025
27th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2024)
|
|
|---|---|---|
| Article Number | 01003 | |
| Number of page(s) | 8 | |
| DOI | https://doi.org/10.1051/epjconf/202533701003 | |
| Published online | 07 October 2025 | |
https://doi.org/10.1051/epjconf/202533701003
Challenges of repack in the era of the high-capacity tape cartridge
CERN, Esplanade des Particules 1, 1211 Geneva 23, Switzerland
* e-mail: joao.afonso@cern.ch
Published online: 7 October 2025
The latest tape drive technologies (LTO-9, IBM TS1170) impose new constraints on the management of data archived to tape. In the past, new drives could read/write the previous one or even two generations of media, but this is no longer the case. This means that repacking older media to new media must be carried out on a more aggressive schedule than in the past. An additional challenge is the large capacity of the newer media. A 50 TB tape can contain a vast number of files, whose metadata must be tracked during repacking.
Repacking an entire tape also requires a significant amount of disk storage. At CERN Tier-0, these challenges have created new operational problems to solve, in particular contention for resources between physics archival and repack operations. This contribution details these problems and describes the various approaches we have taken to mitigate and solve them. We include a roadmap for future repack developments.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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