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Table of Contents


Test disk to disk transmission for 100Gbps throughput in local environment


We did not achived 100Gbps throughput on disk to disk transmission





Ref spec for 100G DTN

100G Experimental (~2018) DTN Design

(captured at 2021)

If you wish to build a 100G DTN, here are the important hardware considerations:

  1. 100G NICs require PCIe Gen3 x16. If you are assuming all transfers are 4 or more parallel streams, any CPU with a clock rate greater than 2.5GHz should be fast enough to push 25Gbps per flow with the standard tuning applied.
  2. 100 Gbps (or 12.5 GBytes/sec) of disk IO is challenging.

Based on reports from colleagues, to get this much disk I/O you'll need either:

  • 10 SSD NVME PCIe Gen 3 x4 drives (e.g.: Samsung 950 Pro with U.2 to M.2 2.5" adapters), or 8 high-end NVME PCIe Gen 3 x4 drives (e.g.: Intel DC P3700 with U.2, 2.5" version that has high endurance).
  • 24 SSD SATA drives (with two PCIe Gen 3 x8 RAID controllers, or one PCIe Gen 3 x16 controller)

Note that both of these configurations will require a special chassis that can hold that many drives, such as:

Sample drives that have been used for 100G DTNs include:

  • SSD NVME drives:
    • Samsung 950 Pro or Intel DC P3700
  • SSD SATA drives:
    • Samsung PM863 or SM863

(~2020) 40/50/100Gbps Capable DTN Design

(captured at 2022)

The total cost of this server was around $21K in mid 2019.  This system is being tested currently, and we be deployed to ESnet in mid/late 2020. Please note that specifics on configuration will be available after full evaluation.  Note that this server uses VROC, and requires the purchase of a premium license.

  • Base System: Gigabyte R281-NO0 dual socket P 2U server
    • Onboard: VGA, 2 x GbE RJ45 Intel i350, IPMI dedicated LAN
    • 24 x front access U.2 hotswap bays
    • 2 x rear access 2.5” SATA hotswap bays
    • Dual redundant hotswap 1600W PSU

  • 2 x Intel Cascade lake Xeon Gold 6246
    • 12 cores each
    • 3.3GHz 165W TDP processor
  • 12 x 16G DDR4 2933 ECC RDIMM (192G total)
  • 10 x Intel P4610 1.6TB U.2/2.5” PCIe NVMe 3.0 x4 Drives (connect directly to CPU for VROC)
  • 2 x Enterprise 960G 2.5“ SATA SSD (OS, onboard Intel SATA Raid 1)
  • VIntel® Virtual RAID On CPU (VROC) RAID 0, 1, 10, 5
  • Mellanox ConnectX-5 EN MCX516A-CCAT 40/50/100GbE dual-port QSFP28 NIC

DTN tuning