The National Institute for Computational Sciences


How to enable X11 Forwarding on NICS resources via GSISSH using XSEDE's Single Sign On Hub (SSO)?

To enable X11 forwarding on NICS resources that are a part of XSEDE's Single Sign On Hub, do the following:

MAC/Linux Terminals:

  1. Type "ssh -Y (username)", where 'username' is your XSEDE username, then hit Return/Enter.
  2. Enter your XSEDE portal password, hit Return/Enter.


HPSS (Darter and Nautilus): Splitting a HPSS archive into multiple files

You can use the split command to split an archive into multiple files. Please follow the steps and examples provided below.

"Cd" into your /lustre/medusa/ directory where your data is temporary stored and run the following command. Make sure the file striping ( in the directory is appropriate for what is being done.

General: What are the memory limits on the compute nodes of NICS production resources?

Listed below are the limits on the compute nodes of NICS operated resources. Here are the results from some basic tests that were run on our resources to check the real maximum values for allocatable memory and open files:

System   | MaxMem | MaxOpenFiles
Darter    | 31.1GB | 1015
Nautilus  | 32.1GB | 48
Keeneland | 32.1GB | >2048

HPSS (Darter and Nautilus): How do I check my usage on HPSS?

In order to check one's usage on HPSS, enter the "hsi" command. Then, use the HPSS "du" command in the most top level directory, or "du -s" (summary for the entire directly only) option.

For example:

O:[/home/username]: du
2137614 4 /home/std00/
305920049 1 /home/std00/directory1/ 86648223 1 /home/std00/directory2/ 211942420 1 /home/std00/directory3/ 156677661 47 /home/std00/direcotry4/ 6455083743 1 /home/std00/directory5/ 0 0 /home/std00/ ----------------------- 7218409709 total 512-byte blocks, 55 Files (3,695,825,770,765 bytes)

HPSS (Darter and Nautilus): Is it possible for files to be overwritten in HPSS?

The ~ is appended if the user has "autobackup=on" in their .hsirc file. Otherwise, the file is simply overwritten. Another option is to use "hsi cput" instead of "hsi put". Using cput will cause hsi to give a warning message if the file exists. The file that the user is attempting to store won't be written to HPSS, but the old one won't be overwritten. (The user also needs to pay careful attention to the output from hsi so that they'll notice the file wasn't stored.)


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