Harishankar Gandipunga

To be as a AIX and Linux System Administrator with a progressive organization that gives me scope to update my knowledge and skills in accordance with the latest technologies and a part of a team that dynamically works towards growth of organization and gain satisfaction there off.

Having around 6 years of total IT experience as IBM AIX / Linux administrator. Extensive experience in working with new server build, NIM, HACMP and VIO environments.

• AIX Responsibilities:
• User Management - Creating, maintaining, and removing users and groups. Security settings on user accounts and groups.
• Installation, migration and maintenance of AIX operating System Administration and performance monitoring Task on AIX servers.
• File system management using LVM, User, Patch and Security Management, Problem determination.
• Accessing rootvg in system maintenance mode, recovering root password, fixing booting related issues, working with boot list.
• Performing daily health checks of all supported servers and taking steps proactively if any findings observed.
• Disk Storage Management in AIX – Logical and Physical Volume management, configuring disks, working with volume groups, logical volumes, and physical volumes.
• Mirroring volumes groups, logical volumes and working ODM and VGDA and fixing related issues.
• Monitoring the system, cpu, memory and disk utilization using topas, sar, vmstat, netstat, nmon, etc
• Working with paging spaces – creation, increase, decrease paging spaces as per the requirement.
• Server OS Installation, APAR, PTF and ML, TL installation and management. Installing any third-party tools as and when required. Using alternate disk installation method for the same for critical servers to reduce down time.
• NFS Administration, exporting file stems, mounting exported filesystems, working nfs daemons and fixing any mounting issues.
• Configuration of new devices using cfgmgr – faulty disk Replacement incase of any disaster. Working with mirrored logical volumes. Device management, including adding, changing, and configuring physical and logical devices
• Working on HMC, administering, configuration of VIO, LPAR, DLPAR nodes, resource allocation, moving resources as when required dynamically. Mapping vio devices to partitions.
• Working with HMC, creating, configuring logical partitions, performing dlpar operations on dlpar nodes, installing OS on lpars using NIM etc.
• Configure MPIO in dual VIOS configuration, configuring SEA failover.
• Configuring NPIV on dual VIOS setup.
• Installation and new server build for AIX Operating System. Installing AIX in Complete over write, preservation and migration modes.
• Performing installations using NIM master. Building NIM resources, recovering servers using mksysb NIM resources etc..
• Monitoring system by using errpt and troubleshoot system problems.
• Adding, Modifying and Deleting user group accounts in AIX
• Configuration of VIO Clients and installation of OS on VIO Clients through NIM server
• Profile Creation Server Build and OS Installation File system creation, Tools Installation and Performing Quality Analysis on servers
• Hands on Experience on LVM like detecting Disks, creating pv, vg, lv, creating file system, extending, reducing
• Having Knowledge on RAID LEVELS
• User Administration (setup & maintaining account)
• Create file system and extending, reducing logical volume and creating LVM’S
• Moving resources across the LPARs as per requirement/DLPAR.
• Space addition and LVM management in cluster File system using cspoc.
• Move the resource group from one node to another node in cluster.
• Server decommissions.
• Linux Responsibilities:
• Working as member of the UNIX team actively worked on RedHat Linux, SUSE,UBUNTU,servers in handling requests.
• LVM management, FS creation/deletion/Increase/decrease etc
• Users creation, remove, password reset, unlock accounts.
• Sudo access enable, disable
• RHEL ,SUSE,Ubuntu,Cent OS patching & Upgrade
• ILO Access, Activities
• VMWARE Servers Build and OS Installations one new servers.
• VMWARE tool Installations/upgradations and troubleshooting.
• LVM operations on all Linux versions.
• Worked on Patching with HPSA.
• Network configuration and troubleshooting activities like IP swap and assigning IP to the server
• Disk Management - Managing File systems, Partitions on disk using tools like fdisk, make permanent mount via fstab.
• Monitoring the system, cpu, memory and disk utilization using top, sar, vmstat, netstat and procmon logs .
• Experience managing user administration with Open LDAP and pro cient using command ldapsearch, ldapadd and ldapdelete
• Performed OS upgrades for critical servers under production.
• Diagnosis and maintenance of hard ware issues involving single and multiple point failures
• Creating and managing Virtual Machines and Templates, worked with clones and snapshots of Virtual Machines
• Accessing console of server in system maintenance mode, recovering root password, fixing booting related issues, working with boot list.
• Managing LVM in red hat Linux - extending and decreasing of LVMphysical volumes, volume groups, logical volumes and taking LVM Snapshots.
• 24/7 on call rotation for support of production environment
• Involved in building Linux VM's using VM templates and kick start servers to build multiple servers over the network.