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gabriel rosenkoetter

205 West Stiles Street
 phone:
+1 610 662 5087
Philadelpha, PA 19122
 email:
gr@eclipsed.net
Objective:
To support a growing business in a proactive, flexible IT department using my abilities to analyze quickly, understand completely, and explain clearly: first, modern computing, mass storage, and networking systems; and, second, the business drivers, application requirements, and scaling concerns around using the former effectively and appropriately to support small, medium, large, and enormous organizations.

Education:
Bachelor of Arts in Computer Science, Swarthmore College.
Topics of study: operating systems, relational database systems, network programming, distributed computing.

Skills:

Experience:
August 2006 to present:
Senior Systems Engineer for Radian Group, Inc. Management, support, and architecture for HP-UX, Linux, and VMware ESX (hosting Windows and Linux guest OSes) systems, StorageTek tape libraries, NetApp/Decru DataFort inline (fibre channel) encryption devices, and EMC Symmetrix, DMX, Clariion, and Celerra disk storage. Particular focus on the maintenance of and allocation within several enterprise-class VMware ESX (versions 2.5 and 3) farms containing service-level provisioned production, QA, testing, and development virtual machines running Windows 2000/2003 and Red Hat Linux; support and provisioning in communication with application owners for EMC disk arrays presented through various fibre channel SAN switches and, via EMC Celerra devices, as iSCSI and NAS file shares; and maintenance of NetBackup environment under on HP-UX 11i using StorageTek L700 and L180 tape libraries with 9940B tape drives. Specific projects (detailed below):
  • Apply industry-standard and internally-consistent NetBackup configuration to HP-UX master servers in each location.
  • Regular participation in disaster recovery script-writing, exercises and tests.
  • Planning and execution of VMware ESX migration of several three-server farms from 2.5 to 3.0.1 in coordination with a Windows 2000 to Windows 2003 upgrade on the hosted VMs.
August 2004 to June 2006:
Open Systems Engineer for Bank One/JP Morgan Chase. Design, implementation, and third-tier support for several Symantec Veritas NetBackup enterprise-class, production backup environments supporting 1000+ backup clients. Responsible for clustered (with Symantec/Veritas VCS) backup servers on Solaris 8/9/10, HP-UX 11i, AIX 5L, and Windows NT/2000/2003. Participation in a 24/7 on-call schedule, response to enterprise ticketing queue, change management system, and root cause analysis. Support for and interaction with support teams for Oracle, SAP, PeopleSoft, Lotus Notes/Domino, Novell NetWare. Experience with EMC Symmetrix and Clariion disk arrays, NetApp NAS systems, StorageTek L700, 9310, and SL8500 tape libraries, StorageTek 9840 and 9940 and IBM LTO and LTO-2 tape drives, Emulex HBA management, EMC PowerPath, and Symantec/Veritas Volume Manager/vxfs. Interaction with Autosys and Control-M for job scheduling. Recurring projects (detailed below):
  • Build, deploy, and transition to production support Symantec Veritas NetBackup master and media servers supporting network client backups.
  • Configure as NetBackup SAN media servers client (internal customer) application servers as data volume requires.
  • Track and allocate tape drive usage across enterprise tape libraries among several sites with 50+ media servers.
January 2002 to June 2004:
Unix and Linux Systems Administrator for Transcontinental CC3 East. Duties included management and support of Sun Solaris (Sun Ultra Enterprise 450 and Enterprise 3500 hardware, Solaris 7, 8, and 9) and Red Hat Linux (Penguin Computing, Dell PowerEdge, IBM xSeries, and HP/Compaq ML Intel IA32-based hardware, Red Hat 6, 7, 2.1AS, EL 3) infrastructure for development and 24x7, high availability production, participation in a 24x7 on-call structure, design, deployment, and support of SAN storage, automation of production tasks with Perl, backup and recovery design, deployment, and management, disaster recovery organization, and planning for development and expansion of the Unix/Linux environment. Specific projects (detailed below):
  • Redesigned and expanded existing SAN architecture to improve performance and system manageability.
  • Specified, purchased, and installed SAN-based backup & recovery system to provide reliable backup and recovery in an environment lacking trustworthy backups.
  • Designed spam and virus filtering architecture to protect internal mail server from external abuses and permit continued use even while under attack.
  • Implemented Nagios network monitoring software to monitor all Unix/Linux systems for problems, report them, and escalate appropriately.
February 1999 to November 2001:
Swarthmore College Computer Science Program Systems Administrator. Duties included administration of a Sun Ultra Enterprise 450 central server and lab of Sun Ultra 5 and 10 and Sun Blade 100 workstations running Solaris 2.6, 7, and 8, user management (NIS/rsync & SSH), DNS managment, SMTP mail server administration, network administration and security, working with and teaching other student systems administrators, installing software packages required by professors for course work, communication with college computing center.

Projects:
Apply industry-standard and internally-consistent NetBackup configuration to HP-UX master servers in each location.
Standardized NetBackup device configuration, corrected regularly failing Vault configuration, corrected chronic network backup failures, educated and delegated to VMS tape support staff media off-siting, migrating record-keeping from paper to Iron Mountain SecureSync.

Regular participation in disaster recovery script-writing, exercises and tests.
Participated in several passes of increasing detail for disaster recovery scripts, DR tests, exercises, and proofs of recovery.

Planning and execution of VMware ESX migration.
Scheduled migration of ESX 2.5 servers to ESX 3.0.1 in coordination with separately managed project migrating Windows 2000 installed base to Windows 2003, working closely with VMware team-mates and a separate Windows server team, allocated both DMX (including SRDF/AR replication) and Clariion storage both to VMware ESX servers and as raw LUNs passed through to Windows guests.

Build, deploy, and transition to production support NetBackup master and media servers
Implement, configure, tune for I/O throughput, and deploy NetBackup systems running on Solaris, HP-UX, AIX, and Windows for new and into existing backup environments utilizing SAN-attached disk and tape storage, supporting network and BCV-based backups, adhering to enterprise standards and project management deadlines. Required interaction with internal groups for systems administration, SAN disk management, remote site engineering, and production support (of application and base OS) resources.

Configure as NetBackup SAN media servers client application servers
Addition of systems owned and maintained by external lines of business to production backup environments, requiring interaction with backup policy implementation engineers, client project management and systems administration staff, and performance tuning on various operating systems balancing NetBackup, disk and tape speed, and client application performance.

Track and allocate tape drive usage across enterprise
Manage system-specific allocation of tape drives in enterprise tape libraries (StorageTek L700, 9310, and SL8500) with hundreds of tape drives per core data center for infrastructure NetBackup media servers supporting 1000+ backup clients via network and BCV backups as well as client-owned systems configured as media servers with direct (SAN) access to tape drives.

Redesigned and expanded existing SAN architecture
Using Xyratex disk arrays with a dual active/active (Mylex DAC-960) controller configuration totalling 8.67 TB raw storage: reallocated logical units to other hosts, preserving Veritas Volume Manager partitions; optimized LUNs for various purposes (speed, maximum available storage, reliability); obtained performance gains (as much as 160 MB/s from a single LUN) through Veritas VM's dynamic multi-pathing attaching to Sun Solaris systems. Expanded storage volume with less expensive, 4 TB raw Infortrend EonStor Serial ATA-backed FC array, integrating it to existing fabric, matching dual active/active redundancy for use as Veritas VxFS snapshots for tape backups, staging disk for network backups, and emergency evacuation of damaged LUNs in Xyratex array.

Specified, purchased, and installed SAN-based backup & recovery system
Considered a variety of hardware devices from Overland, SpectraLogic, ADIC, and several others, and management software from Legato, SyncSort, Veritas and others. Specified a solution (Overland Neo 4100 and Veritas NetBackup). Installed and configured hardware and software, utilizing Shared Storage Option and Vault components of NetBackup.

Designed spam and virus filtering architecture
Specified and built a solution to act as a filter between the Internet and Exchange server, reducing the load passed through to it and throttling the number of connections made to it in times of high traffic. Any mail rejected is rejected at SMTP time.System built on Red Hat Linux (also tested on NetBSD) using all open source software: Postfix as a mail transport agent, Clam AntiVirus for virus scanning, SpamAssassin for recognizing spam, and Amavis.

Implemented Nagios network monitoring software
Also considered several commercial options (none had sufficient functionality for Unix systems) and OpenNMS. System monitors over 500 services on over 50 systems running Red Hat Linux, Solaris, and Windows 2000. Integrated to perform disk utilization and process monitoring on Unix systems via SSH. Performance tuned to check all services in under five minutes. Established escalation procedures, notifying on-call personnel via email and SMS, on-site operators, and managers, as appropriate. Configured Nagios to take reactive measures to solve problems without notifications where appropriate.

References:
Available upon request.
current as of 2007-09-21