NAS

Wiki for information related to the NASA Advanced Supercomputing (NAS) facility.

Overview

Key	Value	Notes
Machines	Pleiades	Compute
	Lou	Storage and Analysis
	Electra	Compute
	Endeavour	Compute
	Merope	Compute
Job Submission System	PBS
Facility Documentation	Support Knowledgebase

How-To's

How-To's in Separate Wiki's

• Setting Default File Permissions

Backup Data from Scratch Directories

This is done simply by copying data from the /nobackup/$USER directories to your home directory on Lou (lfe). The /nobackup/$USER directories are mounted onto lfe, so transfers should be done on lfe.

It is recommended to mirror the directory structure of your /nobackup/$USER directory on lfe to allow for the data to be easily recovered back to it's original state. This is especially important if you use symlinks (as they are path dependent and will break if either the source file or the symlink itself are not in the correct location).

This can be done with scp, but is recommended to use NASA's in-house utility shiftc. shiftc will automatically perform parallel file transfers, data integrity checks and repairs, and syncing features similar to rsync.

Commands:

jrwrigh7@lfe7: shiftc -r -d --sync /nobackup/jrwrigh7/models/STGFlatPlate/STFM_Tet_dz4-10_dx15 .

This will copy the directory STFM_Tet_dz4-10_dx15 to the current location (.). The flags do as follows

• -r: Recursively copy files from destination
• -d: Create required directories that don't already exist. Equivalent of the -p flag for mkdir
• --sync: Only copy over "new" files, where "new" are any changes to the modification time or file size.
  • If a file exists on destination (.), but not source (STFM_Tet_dz4-10_dx15), it will not be copied back to source nor will it be deleted to match the state of source.

Once this command is submitted, the transfer process will be backgrounded. Progress can be viewed by running shiftc --monitor. Additionally, you will recieve an email with the transfer job is completed.

jrwrigh7@lfe7: shiftc --stop --id [shiftc job ID]

This will stop the given shiftc job. The [shiftc job ID] is the same number that appears beside the output of shiftc --monitor.

More documentation for shiftc can be found in its man page (man shiftc) and on NAS's documentation website.