Senior System Administrator
TCS
Total years of experience :13 years, 10 Months
Designation: Senior System Administrator Duration: Sep 2019 to Sep 2023 Responsibilities:
Linux:
• Manage an environment which has 1500 Linux & 300+ AIX servers and performed end to end Project transition.
• Configuring RedHat Satellite servers, Yum repositories and Troubleshooting activities.
• Manage users accounts for the team access for Redhat Satellite server.
• Build Channels and pull packages from master Redhat Satellite server.
• Red hat Linux patching for version 7 & 8 using Ansible & GITHUB.
• Managed and installed software packages using YUM and RPM and created repository files for ofline servers.
• Configured networking concepts like NIS, NFS, SAMBA, LDAP, SSH, SFTP, SNMP, DNS, DHCP
• Utilized ssh-keygen within DSA encryption to make a connection without a password from a remote Linux cloud server to a local machine.
• Creating and managing Virtual Machines and Templates, worked with clones and snapshots of Virtual Machines.
• Performed LVM Task on Linux like PV creation/migration, VG creation/extension and Filesystems creation/extension
• Linux System Recovery, performance tuning, Disaster Recovery Drills and Compliance & Vulnerability reporting and fixing.
• Configuring distributed file systems and administering NFS server and NFS clients and editing auto-mounting mapping as per system/user requirements.
• Performed OS upgrades and Patch loading as and when required.
• Backing up and restoring files across the network Wrote Technical documentation for various projects and worked with Technical writer to finalize the documents.
• Troubleshooting Backup and Restore problems Creation of LVMs on SAN using Linux utilities Monitored overall system performance, performed user management, system updates and disk & storage management Environment: Red Hat Enterprise Linux, Shell Scripting, Apache, WebLogic, WebSphere.
AIX:
• Responsible for design, planning, Installation, technical support and administration of UNIX systems including: software, hardware and firmware.
• Building new LPARS (AIX/VIO) Using OS clones and OS migrations via NIM
• As Technical Lead performed VIO Server upgradation from 2.2.5 to 3.1.1.25, Frame firmware upgrade, Adapter Firmware upgrade, EMC upgrade and HMC upgrade projects
• Appreciated for Migration of Vplex to Powermax storage from entire environment.
• Experienced in performing DLPAR operations for CPU, Memory and Adapters.
• HACMP/PowerHA Cluster Configuration, Setting up new Cluster environment, Planning, Design, Configuring, Failover testing and verification, Cluster Synchronization, performing HACMP health checks, Physical Volume Management on Cluster, Analyzing cluster statistics and PowerHA Migration from 6.1 to 7.1
• GPFS disk addition and storage migration performed.
Designation: Senior System Administrator Duration: Dec 2017 to Sep 2019 Responsibilities:
Linux:
• Manage an environment which has 1500 Linux and 2000 AIX servers and performed migration from old client Data center to HCL Data center for All servers within time frame.
• Installing, tuning, troubleshooting and patching of Red Hat Enterprise Linux servers.
• Installation and configuration of WebLogic and WebSphere application server.
• Installation, configuration, and maintenance of application servers, and database servers on Linux Servers.
• Scheduled various regular, periodic, future and queue tasks by using crontab.
• NFS management - take care of user accounts/groups, setting up of NFS environment.
• Transferring files from one system to other using FTP and SFTP.
• Monitoring server performance and troubleshooting server related problems to SNMP.
• Processes administration and management like monitoring, start/stop/kill various processes/sub processes.
• Monitor system performance parameters using iostat, vmstat, and fine tuning.
• Systems administration, maintenance, and monitoring various day-to-day operations.
• Creating and maintaining user accounts, profiles, and security rights.
• Installation/upgrade, system startup, and system shutdown as needed.
• Wrote simple bash scripts to ping the servers and add users to the boxes.
• Resolved system errors and crashes, disk space problems, huge file sizes, and file system full errors. AIX:
• Responsible for design, planning, Installation, technical support and administration of UNIX systems including: software, hardware and firmware.
• Building new LPARS (AIX/VIO) Using OS clones and OS migrations via NIM
• Technical Lead for VIO Server operations projects Such as VIO upgrade, Mapping Luns (NPIV and Vscsi), Assigning Virtual adapters (Scsi and Fibrechannel) for Storage allocation
• Addressing Physical hardware Issues such as Physical Disks, Network and HBA cards.,
• Experienced in performing DLPAR operations for CPU, Memory and Adapters.
• HMC and Power Frame Firmware upgrade on Timely basis.
• HACMP/PowerHA Cluster Configuration, Setting up new Cluster environment, Planning, Design, Configuring, Failover testing and verification, Cluster Synchronization, performing HACMP health checks, Physical Volume Management on Cluster, Analyzing cluster statistics and PowerHA Migration from 6.1 to 7.1
• Worked on cron and at job schedule, managing log files, errpt, daily management activities
• Mirroring of volumes groups and fixing VGDA related issues
• Disk replacement techniques, replacing fault disk (mirrored or non mirrored)
• Monitoring the system, cpu, memory and disk utilization using topas, sar, vmstat, netstat, nmon, etc
• Working on daily issues that are generated by monitoring tool - file system issues, filesytem housekeeping, and operating system health checks
Designation: Senior System Administrator Duration: Jun 2015 to Dec 2017 Responsibilities:
Linux:
• Manage an environment which has 4500+ Linux & AIX servers.
• Installing, configuring and maintaining Apache, samba, WebSphere & Web Logic Application Servers.
• Proficient in installation, configuration and maintenance of applications like Apache, LDAP, PHP.
• Package management task performed also Installed 3rd party software on RHEL & AIX OS servers
• Knowledge of Virtualization technologies VMware, Hyper V and Hyperv KVM, ESX servers
• Performed task like service stop/start and opening port for TCP/IP, NFS, SSH, SCP, FTP, SUDO if required.
• Good understanding of IDM / LDAP / AD, DNS, DHCP, SMTP, NIS and NTP services etc.
• Basic understanding of Red hat Satellite service
• Performed Unix/Linux Server reboot activity after running script to collect pre-logs of the server for post validation.
• Creating/updating shell script as per requirement
• Knowledge in Ansible automation, updating the playbook as per requirement.
• Knowledge in Data Migrations & Disaster Recovery.
• Red hat Linux patching for version 7 & 8 using Ansible & GITHUB.
• Taking snapshot backup and clone from Vcenter
• Proficient working experience with vendors like HP, Oracle, Dell, Veritas and RedHat for troubleshooting issues.
• Server Performance monitoring and tuning using vmstat, prstat and top.
AIX:
• Responsible for design, planning, Installation, technical support and administration of UNIX systems including: software, hardware and firmware.
• Building new LPARS (AIX/VIO) Using OS clones and OS migrations via NIM
• Technical Lead for VIO Server operations projects Such as VIO upgrade, Mapping Luns (NPIV and Vscci), Assigning Virtual adapters (Scsi and Fibrechannel) for Storage allocation
• Creating Viirtual Media repositories and Storage pools for Administration purposes.
• Addressing Physical hardware Issues such as Physical Disks, Network and HBA cards..,
• Experienced in performing DLPAR operations for CPU, Memory and Adapters.
• HMC and Power Frame Firmware upgrade on Timely basis.
• HACMP/PowerHA Cluster Configuration, Setting up new Cluster environment, Planning, Design, Configuring, Failover testing and verification, Cluster Synchronization, performing HACMP health checks, Physical Volume Management on Cluster, Analyzing cluster statistics and PowerHA Migration from 6.1 to 7.1
• Providing breakfix for Resource groups failover/Fallback issues, Node Hang (Dead-Man Switch), Synchronization issues, Disk HeartBeat and Miscellaneous ones.
• Well versed in PowerHA migration (Rolling and Ofline)
Designation: System Administrator Duration: Sep 2013 to Jun 2015 Responsibilities:
• Project role includes planning, Building(carving) of new lpars, installation of OS, transitioning the server to prod state, provide steady state support, scheduling and performing upgrades which includes TL and OS on the servers as per the requirement of the customer
• Installation, migration and maintenance of AIX operating systems and servers. To provide support on the whole suite of AIX OS which includes HACMP, HMC, VIOS and LINUX.
• VIO Server operations Such as VIO upgrade, Mapping Luns and Assigning Virtual adapters (Scsi and Fibrechannel) for Storage allocation
• Working with HMC, creating, configuring logical partitions, performing dlpar operations on dlpar nodes, installing OS on lpars using NIM etc.,
• HMC and Frame Firmware upgrade
• LPAR transition and decommission which involves a full life cycle of an LPAR from build to SUNSET
• Configuring Backup client and ensuring the MKSYSB backups are running on AIX/VIO servers for smoother recovery during failures.
Responsibilities:
• Installation, migration and maintenance of AIX operating systems
• Server OS Installation, APAR, PTF and TL and SP upgrades and management to keep up to Compliance requirements.
• Installing and configuring VIO Servers, building LPAR clients and sharing IO devices to LPARs
• Performed VIO, HMC, Frame Firmware and PowerHA upgrades.
• Cluster Failover and Fallback testing. Resolving the Sync and Node Hung Issues.
• Build & configure new NIM server
• Migrating the data from OLD LUNs to new LUNs from AIX side
• Restoring a server from a mirrored MKSYSB image.
• Change Implementation plan, ensuring that a Risk Assessment and Impact analysis is undertaken to ensure timely implementation of the changes without major glitches
• Respond to customer inquiries on technical issues
• Resolve and troubleshoot simple or complex issues relating to customers
• Provide qualitative technical services to customers
• Troubleshooting issues pertaining to the OS and hardware related
• Dealing with Addition, Modification and Deletion of User Id's on UNIX.