Clarence Levister
Frederick,MD
Summary
Extensive experience and competence installing, tuning and administration of IBM Spectrum LSF and Symphony. Demonstrated competence in installing and administering Linux and various flavors on Unix operating systems. Demonstrated competence in design, installation, tuning and administration of LSF compute clusters. Demonstrated results in solving storage throughput issues in a large compute cluster with several thousand machines. At Cadence Design Systems, was on a team that moved the entire development organization's build and test environment from small individual groups of hardware to a companywide compute grid using LSF and Condor. Servers were various flavors of UNIX and Linux. Extensive experience in finding, installing, and troubleshooting open-source tools to solve unique problems that are encountered in day-to-day operations. Seasoned Linux System Administrator with 25 years successfully managing diverse distros and multi-site installations. Proficient at streamlining all scales of system architecture, from single terminals to7500 networked servers. Expert at maintaining smooth operation of Linux-based hardware installations with dynamic performance in environments relying upon diverse operating systems.
Overview
21
21
years of professional experience
Work History
Linux Systems Administration and LSF/Symphony Administration
IBM/Kyndryl
2015.01 - 2022.11
- Worked on site at Fannie Mae administrating LSF and Symphony
- Building and rebuilding LSF servers, and keeping servers up to latest patch levels
- Installed and administered GPFS on the grid 3500 servers
- Installed LSF and built new clusters when needed for expansion
- Wrote scripts to install, deploy and execute various scripts to perform system maintenance on various grid 3500 servers.
- Supported directly and indirectly hundreds of customers within Fannie Mae.
- Ensured high availability of critical systems by proactively monitoring server health and addressing potential issues before escalation.
- Collaborated with cross-functional teams to integrate new applications into existing infrastructure, ensuring smooth deployments and optimal performance.
- Managed multiple projects simultaneously while adhering to strict deadlines, prioritizing tasks based on business needs and resource availability.
- Developed scripts for automating routine tasks, reducing human error and increasing overall efficiency in the administration process.
- Resolved complex technical issues promptly by leveraging strong troubleshooting skills and root cause analysis techniques.
- Provided hands-on support for end-users experiencing issues with Linux-based systems or applications, facilitating quick resolutions and minimal disruptions to productivity.
- Actively participated in disaster recovery planning exercises to ensure preparedness for any unexpected events that could impact critical systems.
- Contributed to incident response efforts as needed to address urgent situations quickly and effectively.
- Provided training and mentoring to junior team members, building their skills in Linux administration and fostering a collaborative work environment.
- Maintained smooth operation of multi-user computer systems through collaboration with hardware and network engineers.
- Interacted directly with users to diagnose and correct major system issues and address concerns.
- Resolved issues and escalated problems with knowledgeable support and quality service.
- Diagnosed and resolved hardware and software issues.
- Diagnosed and executed resolution for network and server issues.
- Maintained flexible schedule and responded to after-hours and weekend emergencies.
- Identified and resolved network congestion issues and bottlenecks.
Asic and LSF Migration
Ericsson
2012.01 - 2015.04
- Working on a large project to migrate 100+ users from a Redback.com legacy environment to an Ericsson Hub environment
- Responsibilities include making sure the groups test suites run in new environment, and making modifications to the suite when it did not run.
- Primary responsibility was to set up an LSF environment so that the user's tests of ASIC chips ran in LSF an LSF environment.
- Built the GRID's web servers, database servers, and provided this grid with high availability clusters for management servers.
- Many scripts were modified to take advantage of latest version of LSF.
Systems Administration
Corning, Inc.
2009.01 - 2012.01
- Participated in migration of user and lab machines migration from Windows XP to Windows 7
- This included working with VB scripts and Alteris
- This took place at various sites around Corning, NY.
IT Architect
Cadence Design Systems
2002.01 - 2009.01
- Cadence is an engineering design automation company.
- Was in the Server Farm Initiative group supporting the development organization as well as deploying a proprietary build and test solution to these various groups within development.
- Duties included: Working with individual groups, analyzed their build and test process, wrote a proposal, and automated the processes to run on the company's compute grid.
- Automated the releases of various group's software such that whatever platform and OS version a particular package ran on, the software was built, tested and appropriate documentation was generated for certification for release to users.
- Built the grid's web servers, database servers, and provided these with high availability clusters to provide users with reporting and storage of the results of their builds and tests.
- Participated in building and deploying all of the developer's tools in one central location so that companywide all would be using the same tools.
- Installed, administered and tuned IBM/Platform Computing LSF
- Was deeply involved in the design and implementation of a proprietary job control system which ran on top of LSF to increase throughput of build and test jobs for 2500 developers.
- Clusters, VERITAS file systems and Volume Manager
- Performed DBA duties for PostgreSQL databases.
- As a result of these efforts, build and release time was significantly reduced, hardware was better utilized, and procedures from group to group were standardized.
- Collaborated with clients to develop customized architectural solutions, meeting their unique needs and preferences.
- Maintained strong communication with clients throughout the design process to ensure alignment between their vision and the final product.
- Identified issues, analyzed information and provided solutions to problems.
- Participated in team projects, demonstrating an ability to work collaboratively and effectively.
- Provided exceptional technical support to end-users, promptly addressing any reported issues or concerns with system functionality.
- Coordinated data backup strategies, safeguarding critical business information from loss or damage due to unforeseen events.
- Conducted training sessions for staff on new technology implementations, increasing overall adoption rates and productivity levels.
- Diagnosed and resolved hardware and software issues.
- Devised scripts and automation tools to improve system efficiency.
- Analyzed complex project server issues and worked on large enterprise and business-critical applications.
Education
High School Diploma -
Storm King School
Cornwall-on-Hudson, NYSkills
- C as well as other programming languages
- Perl, various UNIX and Linux shell scripting languages.
- Performance Testing
- Load Balancing
- Linux
- System Maintenance
- Server Management
- Shell Scripting
- Linux Server Management
Timeline
Linux Systems Administration and LSF/Symphony Administration
IBM/Kyndryl
2015.01 - 2022.11
Asic and LSF Migration
Ericsson
2012.01 - 2015.04
Systems Administration
Corning, Inc.
2009.01 - 2012.01
IT Architect
Cadence Design Systems
2002.01 - 2009.01
High School Diploma -
Storm King School
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