Data Transfer Nodes (DTNs)
The Data Transfer Nodes (DTNs) are hosts specifically designed to provide optimized data transfer between OLCF systems and systems outside of the OLCF network. These nodes perform well on local-area transfers as well as the wide-area data transfers for which they are tuned. The OLCF recommends that users use these nodes to improve transfer speed and reduce load on computational systems’ login and service nodes. OLCF provides two sets of DTNs: one for systems in our moderate enclave and a second for systems in the open enclave.
DTN access is automatically granted to all enabled OLCF users. For interactive access to DTNs (
sftp), connect to
dtn.ccs.ornl.gov (for the moderate enclave) or
opendtn.ccs.ornl.gov (for the open enclave). For example:
For more information on connecting to OLCF resources, see Connecting for the first time.
Access From Globus Online
DTNs are also accessible via the “OLCF DTN” (for moderate) and “NCCS Open DTN” (for open) Globus endpoints. For more information on using Globus at OLCF see Globus.
Batch Queue (Slurm)
The moderate DTNs also support batch jobs. The system contains 8 nodes accessible through the DTN batch system.
Most OLCF resources now use the Slurm batch scheduler, including the DTNs. Below is a table of useful commands for Slurm.
|View batch queue||
|Submit batch script||
|Submit interactive batch job||
|1-4 Nodes||0 - 24 hrs||max 1 job running per user|