Goal

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


Method


Ref

Ref spec for 100G DTN

100G Experimental (~2018) DTN Design

(captured at 2021) https://fasterdata.es.net/science-dmz/DTN/100g-dtn/

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) https://fasterdata.es.net/DTN/reference-implementation

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

https://fasterdata.es.net/DTN/tuning/



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