Frequently Asked Questions

ssh gateway2.marcc.jhu.edu -l userid
HOME Directory: 20 GBytes (/home/userid)
Lustre: 1 TByte per group (/scratch/users/userid and /scratch/groups/groupid)

The Deans of the schools will make decisions on how to allocate resources.

Type the command “groups”.
Use the “interact” command and interact -usage for options.
HOME directories and WORK-ZFS if you have one.
To find out the group utilization the PI should use the command sbalance. It will give information about utilization by all members of the group.
For a summary of available partitions and their status, use the command sinfo -s
An email will be sent out to all users. Also, please check the website, HOME page.

DTNs are a set of dedicated nodes for file transfer. These servers are GlobusConnect end point and should be used to transfer large amounts of data.

  1. ssh dtn2.marcc.jhu.edu (with your username and passwd)
  2. scp largefile.ext userid@your-destination
    Note that the speed is limited by the connectivity at your destination
  3. Form your machine to MARCC: scp largefile.ext userid@dtn2.marcc.jhu.edu:~/
  4. Use the Globus connect end point
    1. Request a GlobusConnect account
    2. Login into your globus connect account
    3. Select the end points (MARCC)
    4. Authenticate to your end points
    5. Select the file(s) to transfer
    6. Start the file transfer

Users who need to run jobs immediately may be able to find out if resources are available. Use the command:
sinfo -s

A/I/O/T = Allocated/Idle/Out/Total

This research project (or part of this research project) was conducted using computational resources (and/or scientific computing services) at the Maryland Advanced Research Computing Center (MARCC).”

Please feel free to edit it and/or include more details.