Today the preferred technical solutions for long term storage (> 20 years) are mainly based on hard disk arrays and/or magnetic tape libraries. However, these technologies poorly address few major aspects of the LTDP question:
- Total Cost of Ownership, as history shows that periodic migrations (3 to 5 years) are necessary and moreover lessons learned point to a number of operational costs such as power, s/w licenses, operations besides mere h/w devices and media procurement costs.
- Longevity, as both tape technology and periodic migration induce a data loss (estimated at least 1% a year).
- Storage solutions based on optical media have recently overcome known limitations on performances and capacity.
This technological acceleration, consolidated in 2014, together with its intrinsic advantages, identifies the brand new Optical Disk Archive technology as the new long term solution, with the following benefits:
- Highly mitigates costs (TCO shrinks by a factor of 10 wrt HD)
- Provides a unique technology to preserve data for 50 years at least with very limited need for migration
- All above without loss of performance, on the contrary, improving on the overall data access times wrt to LTO (see above video).
On the basis of this technological step ahead, ACS has decided to fully exploit this opportunity and upgrade its assets for Archiving and Inventory solutions in the context of space or science data. ACS intends to propose to its customers a complete and integrated solution based on ODA technology, ARK, for archive services aimed at long term data preservation.