Sr. unix admin
Resume:
Senthil Krishnan
***********@*****.***
SUMMARY
Have 8+ years of experience in system design, installation, networking, maintenance and administration of large-scale Solaris, AIX and Linux servers in the production environment.
o Install, setup, and utilize the Jumpstart server for OS provisioning of Solaris.
o Experience working in environment of 1000+ servers and supporting Solaris and LINUX operating system servers in Global Data Center environment.
o Experience in working with Virtualization Technologies including VMWare Infrastructure 3.0 and Solaris 10 LDOMs and Zones
o Experience in migrating physical servers to solaris LDOMs and zones
o Experience working on veritas and SUN clusters
o Extensive experience on Enterprise T5240, Midrange M4000, M5000 and High-End servers.
o Assisting clients on resource management and technical architecture also participating and updating the team in Unix/SAN/Technical architecture weekly meetings
o Responded and resolved production environment servers problems quickly on a timely basis.
o Responsible for 99% uptime of the servers by giving 24/7, round the clock service.
o Provided incident report and root cause analysis.
o Experienced in Documentation on client’s requirements and System Specifications
o Communicate with various departments to obtain upcoming project information to forecast/plan accordingly
o Container and Resource pool planning and configuration, hardware management consol and its associated tools.
o Worked closely with vendors and Database services team, and application support team to take proper corrective measure to prevent repeated systems failure or performance problems.
o Experience and knowledge of Scripting languages like Shell, Perl, Awk
o Experienced with remedy ticketing system and change management process.
o Ensure high systems availability and stable operations of overall UNIX infrastructure, Adheres to problem resolution, escalation procedures, and notified management of problem areas and develops backup strategy, fall back plans and recovery plans.
o Possess excellent communication skills and strong interpersonal skills, which provide the ability to interact with end-users, managers, and technical personnel
TECHNICAL SKILLS
O / S Solaris 6, 8, 9 and 10, LINUX (SuSE 10, 9.0), RHEL 4/5, AIX (4.X, 5.2 and 5.3), zLinux
HARDWARE SUN Architecture M4000, M5000, T5240, T5220, T-2000, 6800, 4800, 4500, E15k, E450, E420, V480r, V280r, V890, V490, v240, v280, v440, v480. IBM P Series p570, p550, HMC 4.5 and 5.2.1, HP DL385, DL 585
SOFTWARE’S Veritas Volume Manager 5.1/5.0/4.1/3.5, Veritas File System 5.1/5.0/4.1, Veritas Cluster Server (VCS) 5.1/5.0/4.1, SUN cluster 3.3, 3.2, 3.1, Solstice Disk Suite, ZFS, Vmware, Powerpath, Autosys 4.5, Legato Backup manager, mksysb, veritas Netbackup
STORAGE MANAGERS EMC Symmetrix and Clarion, Hitachi, Netapp filers, EMC powerpath
PROTOCOLS TCP/IP, FTP, SMTP, SFTP, SCP, DHCP, NFS
SERVERS MAINTAINED Application Servers, Database servers, Web Servers, Cluster servers, vmware intances
SCRIPT Bash, korn, bourne
Virtualization
VMWare ESX Server2.0-3.02, Solaris LDOMSs 2.0/2.1 and Zones/Containers
PROFESSIONAL EXPERIENCE:
CLIENT: CEG- CONSTELLATION ENERGY GROUP- BALTIMORE, MD March’ 11 – till date
SR. UNIX SYSTEM ADMINISTRATOR
Constellation Energy (NSYE: CEG) is a leading competitive supplier of power, natural gas and energy products and services for homes and businesses across the continental United States.
Part of Engineering/Tier3 support team for UNIX and Linux servers.
Responsibilities:
o Installation and configuration of servers through jumpstart and kickstart
o Performed patching on solaris servers
o Worked on installation of Veritas cluster on solaris and linux platform
o Experience in building solaris virtualization of zones and LDOMs
o Worked on setting up Live migration of LDOMs between SUN T3-2 hardware
o Worked on migrating physical servers to LDOM virtual servers and zones
o Experience in configuring veritas cluster resource for oracle databases on solaris and linux platforms
o Configured 2 node Sun cluster with solaris zones in failover capability
o Experiencing in managing user accounts and access via VAS using AD authentication
o Responsible for VAS upgrade project throughout the environment
o Experience in configuring monitoring policies on HP Openview
o Experience working on Solaris DiskSuite. Veritas volume manager and linux LVM volume managers
o Wrote scripts for monitoring and automation of software installation across the board from admin servers
o Experience in capacity planning and performance testing and enhancements on solaris servers
o Experience in working with NAS and SAN storage for data sharing and consolidation
o Worked with storage team for migration of oracle backups from X86 environment to netapp NAS environment
o Responsible for on-call support 24x7 of 500+ servers including solaris and Linux on rotational basis
o Experience in ZFS file systems and Zpools
o Worked with application teams in capacity planning, testing, development and production release of the servers
o Worked with business unit for application specific requirements
o Documented procedures for tier1 and tier2 support for low level and repetitive tasks
o Experience working with change control process for changes made to the environment
o Experience working based on ticketing system through HP service manager
o Experience working with system tools such as Dtrace, truss for troubleshooting purpose
ENVIRONMENT: Sun T3,Sun T5220/T2000, Enterprise M5000/M4000, Sun Enterprise 240, 480, V490, e2900, e15K, Solaris 9 and 10, Redhat linux 5.2/5.3/5.5, Veritas 4.1, 5.0, 5.1, veritas cluster 4.1, 5.0,5.1, Sun cluster 3.3, Oracle 9i/10g, Tibco, maximo, Netapp, Netbackup, HP DL385, DL 585
CLIENT: AIGGS-AMERICAN INTERNATIONAL GROUP GLOBAL SERVICES, NJ May’ 06 – March’ 11
SYSTEM ADMINISTRATOR/ENGINEER
As a member of UNIX Operations team, provided Solaris / Linux Admin support by working on multiple projects in UAT/Development/Production Environments, systems support, service requests, patches, packages and tools upgrade. Responsibilities included planning data migrations, troubleshooting VCS, working closely with DBA and application teams to fix problems and enhance performance. Was also part of UNIX engineering team for 6 months dedicated to veritas and SAN software upgrade across the environment.
Responsibilities:
o Installation and configuration of Sun Solaris Servers through jumpstart, Installation of Packages, Patch Management and Upgrades
o Performed server live upgrades from Solaris 8 to 9.
o Performed server live upgrades from Solaris 8 to 10 and Solaris 9 to 10.
o Managed high available database and web application infrastructure servers on veritas cluster running solaris 10 zones as service groups on M5000, T5240 hardware. Clusters comprised of four, six and nine node configurations shared by multi database instances which spanned across multi terabyte storage subsystems.
o Responsible for configuring/creating resources for new databases/applications under veritas cluster 4.1, 5.0, 5.1 and Sun cluster 3.2 on solaris 10 and SUSE linux environment.
o Responsible for troubleshooting and maintenance of veritas cluster under solaris 10 with numerous local zones
o Worked on testing various applications on Solaris 10 and in the process created zones, containers and resource pools.
o Extensive experience in – Dtrace, Cluster/ SAN Environment, Resource pool Management
o Creation of ZFS file system using zpools, set up quotas in zpools.
o Experience in performing firmware upgrade on T5240 via web based interface
o Responsible for supporting 24x7 of 1000+ servers including solaris and Linux on rotational basis
o Mirroring of root disks using Sun Volume Manager
o Responsible for migration of storage to new EMC frames and part of consolidation project
o Upgrading OS and application software and applying patches for 2007 DST readiness of all servers
o Experience in configuring EMC and Hitachi storage LUNs on the server side as per requirement
o Experience with Veritas Volume manager and File system via the CLI.
o Configuration of LOFS filesystem on solaris 10 servers
o Upgrade of Veritas 3.2/3.5/4.0 to Veritas 4.1 version on Solaris 8 and 9 servers
o Applied Maintenance patches to the Veritas 4.1 version
o Performed Veritas storage Foundation software upgrade on Solaris 8, 9 and 10 servers
o Performed veritas cluster upgrade from 4.1 to 5.0 on SUSE linux 10 servers
o Experience in patching of servers though SUN XVM
o Installation of packages and patches on Solaris and RPMs on Suse linux servers
o Experience in maintaining/troubleshooting of Linux instances on Vmware servers
o Experience in using solaris Volume Manager/Solstice DiskSuite, Linux Logical Volume Manager for Disk Device Management.
o Experience in Symantec ESM product for making the server compliance with security standards
o Dynamic Reconfiguration in Sun High-End Servers 15K, 6800 and 6900
o Performed firmware upgrade on the SUN 4800 and 6800 system controllers
o Proficient in performance monitoring and tuning in Sun SPARC Systems.
o Handling CPU panic, memory problems and other hardware failures with coordination of vendors.
o Worked with legato software for restoring backups from tape to unix servers
o Implementing various RAID levels to improve the availability and performance on UNIX and linux servers.
o Responsible for updating filesets and APARs in AIX periodically.
o Provide infrastructure support in a software development, DIT, UAT and Production environments
o Upgraded the AIX systems Maintenance levels
o Control-M software installation on the AIX servers
o Configuring various applications and products on a wide range of Sun Enterprise servers
o Detecting System Failure, Resource Failure and hardware failure on Solaris and Linux platforms
o Responsible for installation and configuration of local and remote Printers
o Made Regular Mksysb Backups both in ISO and UDF formats
o Wrote shell scripts to customize any customer specific application requirement.
o Worked with Remedy (AR) ticketing system for incident tickets.
o Documented procedures for patching, upgrade and day to day support activities.
o Performed autosys client installation and SAP adapter on Solaris 8 and 9.
ENVIRONMENT: Sun T5240, Enterprise M5000, Sun Enterprise 420R, 450, V490, 3500, 4500, 6800, 8800, 15K, Solaris 8, 9 and 10, Veritas 3.5, 4.1, 5.0, veritas cluster 4.1, 5.0, IBM P570, 550 with AIX 5.2 and 5.3,Linux,Autosys, Legato storage manager, SuSE linux 9/10, Oracle 9i/10g, DB2, Sybase, Sun disk arrays, HP DL385, DL 585.
NETALPHA, GA JAN’ 05 – APRIL’ 06
SYSTEM ADMINISTRATOR
Responsibilities:
o Installation and configuration of Solaris 8 and 9 operating systems
o Created and maintained JFS and NFS file systems.
o Performed server upgrades from Solaris 8 to 9
o Upgrade of Veritas 3.2/3.5/4.0 to Veritas 4.1 version on Solaris 8 and 9 servers
o Installation and Configuration of VERITAS Volume Manager for Volume Management which includes creating New Volumes, Increasing the size of existing volumes. Using Volume manager to create diskgroups and volumes, adding disks into the diskgroup and replacing failed disks, increase filesystems in Vxvm, initialize disk in Vxvm
o Experience in configuring of Sybase and oracle database resources under veritas cluster 4.1
o Worked on Red Hat – RHEL 3/4 linux servers on day to day activities
o Configuration of SAN storage on solaris and AIX servers
o Experience with handling of resource groups and service groups in the cluster environment
o Configuration of virtual IPs as per client’s request
o Was involved in the configuration of the Domains, Dynamic Reconfiguration, Changing system boards on E15K using SMS
o Performance tuning of the operating system for better application better application performance and network performance.
o Monitor and system administration including Install/Update patch software, firmware, and security patches for all applications in installed infrastructure
o Implemented Solaris 10 and upgraded from Solaris 8, 9 to Solaris 10 using live upgrade with various applications to check the compatibility of the software and the tools.
o Provided 24x7 on call support on rotational basis
o Handling CPU panic, memory problems and other hardware failures with coordination of vendors.
o Performed SAN allocation to the AIX and Solaris servers depending on the requirements of the client.
o Configuring various applications and products on a wide range of Sun Enterprise servers
o Experience with Veritas Volume manager and File system
o Provide infrastructure support in a software development, DIT, UAT and Production environments
o Configure groups & users; enable high-end security based secure-ids for all users to log onto the Servers
o Installation of packages and patches on Solaris, and AIX servers.
o Performed firmware upgrade on the pseries AIX servers
o Upgraded the AIX systems Maintenance levels
o Installation and configuration of Sun Solaris operating systems
o Created and maintained users and groups.
o Performed troubleshooting of various printer problems and granted access to printers for the end users.
o Using various monitoring tools like top, sar, vmstat, HP open view glance plus for tuning the systems for maximum efficiency.
o Maintained records for hardware, status of backup and also documented procedures.
o Wrote scripts for automation of administration tasks.
Environment: Solaris 8,9, 10, AIX 5.2, RHEL 3/4, p series 550, 570, RS/6000 R50, E4500, Autosys, VERITAS Volume Manager, VERITAS Netbackup, SUN Enterprise 420R, 450, V490, 3500, 4500, 6500, 8800.
DIMENSION DATA, OH AUG’ 03 – DEC’ 04 UNIX SYSTEM UNIX ADMINISTRATOR
Responsibilities:
o Installation of the Solaris and AIX Operating System.
o Building a Server from the Scratch, File system management, backups, process control, user administration
o Upgraded from Solaris 8 to Solaris 9 using live upgrade with various applications to check the compatibility of the software and the tools.
o Work on re-engineering of the existing environments to upgrade the systems, applications and tune for better optimization of resources. This included server consolidation and remediation
o Worked with Open Boot PROM and define Boot process
o Upgraded the AIX systems Maintenance levels
o Experience with VERITAS Volume manager and File system
o Implementing various RAID levels to improve the availability and performance.
o Encapsulating root disk under the Volume manager, Disk replacement under the control of Volume manager, Recovery of root dg when corrupted and online relay out of the volumes.
o Performed data move in VERITAS volume manager for SAN migration
o Upgraded software and hardware in existing systems based on service level.
o Performed firmware upgrade on the pseries AIX servers
o Created and maintained JFS and NFS file systems.
o Provided 24x7 on call support on rotational basis
o Performed User administration
o Installation and configuration of various packages and patch administration
o Monitored and configured additional paging space, file system expansion
o Responsible for planning and implementing upgrades of UNIX server, web server and UNIX to PC connectivity including print sharing & file sharing
o Restoring system using mksysb backup.
o Applying latest MLs, patches and fixes
o Installed and configured SysBack4.0 on AIX.
o File System and LVM Management - Maintenance of file system which include Creating new file systems, Resolving High file system problems, Removing file system, Change ownership, Mounting, unmounting, auto mounting (/etc/fstab) a file system, Creating large enable filesystems, Managing disk space utilization. Extending or reducing existing file systems, Creation of PV's, VG's & LV's, Mirroring of LV's, Splitting mirrors, removing unwanted LV's. Extending & Reducing VG's & LV's etc.
o Backup of server data to tape.
o Written shell script to move log file to common box by using crontab to automate process.
o Performed troubleshooting on problem accounts and resolved access problems related to account parameters
o Day to day system administration of Solaris, AIX servers and user support.
o Dealt with 24/7 emergencies on an on-call basis
Environment: AIX 4.3, 5.2, Solaris 2.6,8 p series 570, RS/6000 R50, E4500, VERITAS NetBackup, Windows NT.
Education:
Masters in Electrical and Computer Engineering
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