Content tagged with #Technical-Bulletins

September 16, 2014.
Livermore Computing (LC) recently expanded the capacity and network bandwidth of three of its Lustre file systems—lscratchd, lscratch6, and lscratch7.

April 15, 2014 | UPDATE: This purge policy is superseded by TB#523.
The purge policy outlined herein supersedes the purge policy in Technical Bulletin Nos. 351 and 411. This updated purge policy will go into effect on all of the /p/lscratch* Lustre file systems on the Open and Secure Computing Facilities (OCF and SCF) beginning April 15, 2014.

February 20, 2014.
Livermore Computing (LC) will be retiring a number of older, ldiskfs-based Lustre file systems. The current retirement schedule is found in this technical bulletin.

February 13, 2014.
To improve file system reliability on the Secure Computing Facility (SCF), Livermore Computing (LC) is reducing the complexity of the SCF Lustre file system environment by moving all file systems to the same software and hardware versions, reducing the total number of file systems to four (from six), and mounting file systems from fewer clusters.

February 11, 2014.
Livermore Computing (LC) currently offers two methods for moving files from the Open Computing Facility (OCF) to the Secure Computing Facility (SCF). One method uses an electronic One Way Link (OWL), and the other uses tape technology and computer operator “sneakernet.” Moving files from the SCF to the OCF uses only tape technology/sneakernet for file transfers. There is no OWL available to transfer files from the SCF to the OCF.

October 8, 2012.
MyLC, the Web-based high performance computing portal for Livermore Computing (LC), has been enhanced since its initial release last year. For regular users of MyLC, the enhancements are highlighted below, and for those who have not used MyLC, the information herein serves as an introduction.

November 7, 2011.
The MyLC dashboard, part of the Lorenz effort, is now available to all LC users in both the OCF (CZ and RZ) and SCF. Lorenz aims to simplify users’ HPC experience by leveraging modern Web application technologies. The MyLC dashboard is the first step in reducing tedious and awkward tasks associated with HPC and providing access to key HPC tools and information.

October 20, 2011.
It is Livermore Computing (LC) policy that user directories may not have world read, write, or execute permissions set to allow all users the ability to view, modify, or execute files contained in them. To enforce this policy, LC will monitor the permissions on top-level directories in the following file systems:

September 26, 2011.
To address the need for Restricted Zone (RZ) users to move data between their desktops and the RZ, Livermore Computing (LC) has deployed a machine named rzstage that allows easy and secure file transfers using SCP or SFTP between RZ users’ desktop machines in the LLNL Enterprise Network and file systems mounted in the RZ.

August 10, 2011.
Livermore Computing (LC) is continuing the process of moving its Open Computing Facility (OCF) resources from the LLNL Enterprise Network (EN) into a multi-zone High Performance Computing (HPC) Enclave. This Technical Bulletin contains brief background information about the HPC Enclave, provides the current schedule of important upcoming events, and answers some frequently asked questions that LC has received during customer meetings and briefings.