CDS (Custodial Disk Storage), a disk-based custodial storage powered by CERN EOS storage system, has been operating for the ALICE experiment at the KISTI Tier-1 Centre since November 2021. The CDS replaced existing tape storage operated for almost a decade, after its stable demonstration in the WLCG Tape Challenges in October 2021. We tried to challenge the economy of tape storage in the aspects of data protection and storage capacity by purchasing cheap off-the-shelf disk enclosures and applying four-parity mode of EOS RAIN (Redundant Array of Independent Nodes) layout. In order to get a brief picture of the TCO (Total Cost of Ownership) of the CDS comparing with tape storage, we tried to conduct an estimation of acquisition, operation and other costs on both tape and disk-based custodial storages. A detailed discussion will be presented including capital and operating expenses over time for the custodial storages such as initial purchases and their expansions (with some predictions on the CDS), spaces, installation, software and hardware licenses, maintenance and power consumption.
|Consider for long presentation||Yes|