The Daily Bulletin

 CISL has scheduled an extended High Performance Storage System (HPSS) downtime for Wednesday, Jan. 28, for preventive maintenance. HPSS will be unavailable from 9 a.m. to 4 p.m. MST for the installation of 20 new tape drives and for quarterly deep cleaning of both tape libraries.

The Extreme Science and Engineering Discovery Environment (XSEDE) will present a full-day tutorial on Friday, February 6, to introduce programmers to techniques essential for using the Intel Xeon Phi co-processor architecture efficiently.

Multiple lectures and hands-on exercises will be used to acquaint experienced C/C++ and Fortran  programmers with the Xeon Phi platform and to explore the different execution modes as well as parallelization and optimization through example testing and reports.

All exercises will be executed on the Stampede system at the Texas Advanced Computing Center (TACC). Visit the XSEDE course calendar to register for this webcast.

The NCAR Data Sharing Service now allows users to share data more easily with large audiences by making files accessible to all Globus account holders rather than to specified individuals or groups.

The service is for users who have access to NCAR storage resources such as GLADE and HPSS, typically through the Yellowstone system or via CISL's data-access nodes. It lets users share data with anyone who has a free Globus account and a place to store the data.

Users can still grant permissions on an individual or group basis if there is a need to limit access.

HPSS:   Downtime Wednesday, January 28 , 9:00am - 4:00pm

No Scheduled Downtime:  Yellowstone, Geyser_Caldera, GLADE

Storing large files in your GLADE file spaces is more efficient than storing numerous small files, so consider creating tar files when you can. The system allocates a minimum amount of space for each file that you keep, no matter how small it is.

On /glade/scratch, for example, where the block size is 4 MB, the smallest amount of space the system can allocate to a file is 128 KB (the "sub-block" size). Files smaller than 128 KB are still allocated 128 KB, so they require more space than you might expect.

See CISL best practices for more information.