Many ways to store data devices distnb //c/ A variety of storage devices Main differences o Capacities from 1 GB to 10TB per unit o Prices from 1 to 300 for the same capacity o Very different reliability o Very different speeds Typical numbers in 2018 Capacity Latency $/TB Speed reliability per unit RAM 16GB 5ns 9000$ 10GBs-1 volatile SSD 500GB 10μs 300$ 550MBs-1 poor HD 6TB 3ms 25$ 150MBs-1 average Tape 10TB 100s 20$ 500MBs-1 good too HSM 5/42 S.Ponce-CERNMany ways to store data 5 / 42 S. Ponce - CERN devices distrib // c/c zoo HSM A variety of storage devices Main differences Capacities from 1 GB to 10 TB per unit Prices from 1 to 300 for the same capacity Very different reliability Very different speeds Typical numbers in 2018 Capacity per unit Latency $/TB Speed reliability RAM 16 GB 5 ns 9000 ✩ 10 GB s−1 volatile SSD 500 GB 10 ➭s 300 ✩ 550 MB s−1 poor HD 6 TB 3 ms 25 ✩ 150 MB s−1 average Tape 10 TB 100 s 20 ✩ 500 MB s−1 good