System Administrator at Kyndryl (2022-02 – Present)
AIX / Linux System Administrator managing enterprise infrastructure with focus on OS upgrades, LPAR management, and high availability solutions.
- Performed AIX OS upgrades from AIX 7.1 to AIX 7.2 on production servers
- Executed online DLPAR operations without service disruption
- Created and managed file systems, troubleshooting mount point issues
- Hands-on experience in Technology Level (TL) upgrades using multiple upgrade methods
- Performed Linux mount point expansion and memory utilization checks
- Worked extensively on Linux LVM activities (PV, VG, LV management)
- Executed OS patching activities across AIX and Linux servers
- Performed AIX OS upgrades from AIX 6.1 to AIX 7.1 on enterprise servers
- Installed and configured AIX Operating System using installation media and NIM server
- Installed VIO servers and created/managed LPARs
- Performed online DLPAR operations, including dynamic changes to CPU and memory
- Managed LPAR processor settings (minimum, maximum, desired processors and memory)
- Worked with dedicated and shared processors, virtual processors, processing units, and shared processor pools
- Performed mirrorgv creation, disk migration, and storage movement activities
- Troubleshot file system and mount point issues
- Applied Access Control Lists (ACLs) to allow multi-user access
- Took regular system backups using mksysb
- Performed HA failover testing by moving resource groups between cluster nodes
- Troubleshot backup failure issues
- Installed and configured IBM Tivoli Monitoring tools
- Handled incident tickets, performed root cause analysis, and managed escalations
- Actively involved in BAU activities, including Change Management and RFS activities
- Installation, administration, and troubleshooting of Linux (RHEL) systems
- Managed Linux LVM activities: creating and extending VGs, LVs, and file systems
- Performed Linux OS patching and migration
- Created and managed user accounts, groups, and access levels using SUDO
- Monitored system health, disk utilization, and web server availability using Nagios
- Scheduled and managed automated jobs using Crontab
- Troubleshot OS-level and hardware-related issues
- Monitored and optimized system performance, including CPU, memory, virtual memory, swap space, and disk utilization
- Raised and coordinated hardware support calls with IBM vendors
- Created and managed user accounts, groups, home directories, and password administration
System Administrator at Tech Mahindra (2020-10 – 2021-08)
System Administrator responsible for AIX and Linux system administration, performance monitoring, and incident management in production environments.
- Monitored system performance, including CPU, memory, disk, and network utilization using tools such as topas, sar, vmstat, iostat, and netstat
- Performed Linux OS updates and patching on production servers
- Managed paging spaces, including creation, increase, and decrease based on system requirements
- Executed backup activities, including rootvg system backups, user-defined volume group backups, and file system-level backups
- Performed user password resets and Technology Level (TL) patching
- Troubleshot OS-level and hardware-related issues
- Monitored and optimized virtual memory, swap space, CPU, and disk utilization
- Implemented, configured, and managed NFS services
- Configured LVM and managed volume groups, logical volumes, and file systems
- Worked with ITIL processes, primarily Incident Management
- Compressed files and directories using gzip
- Part of Incident Management (IM) team, resolving production outages and ensuring resolution within SLA timelines
- Installed, administered, and troubleshot Linux Operating Systems
- Worked extensively with a ticketing-based support system
- Resolved boot-related issues, including working with boot lists, SMS mode, and bosboot
- Configured and troubleshot Network File Systems (NFS) and network-related issues
- Performed alternate disk installation during OS upgrades and patching activities
- Troubleshot performance-related issues across CPU, memory, network, and storage
- Managed AIX disk storage, including physical and logical volume configuration and maintenance
