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Allan Mejia
Senior AIX/Unix Server Engineer specializing in IBM Power, AIX, and enterprise security
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About
AIX/IBM Power veteran (30 years) with hands-on experience across the full stack—hardware installs, HMC/vHMC, VIOS, LPAR/DLPAR, NIM, and PowerHA fundamentals. Led SEV1 performance incidents (including Ethernet adapter tuning) and helped re-platform a large AIX estate to AWS (77 servers to ~120 EC2s) with extensive pre-cutover testing and operational automation (mksysb + sudo provisioning).
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Key Strengths
- Led SEV1 incident troubleshooting on AIX with IBM support and network team; resolved post-switch-upgrade slowness via adapter tuning and reboot
- Deep IBM Power/AIX operations experience (30 years) spanning rack/stack through LPAR/DLPAR/VIOS/vHMC and NIM setup
- Resource/right-sizing using monitoring data (nmon, topas, Patrol) to reallocate CPU/memory across LPARs without disruption
- Executed AIX-to-AWS re-platform migration (77 AIX servers to ~120 EC2 instances) with 6+ months of testing and structured status tracking
- Built automation for recurring mksysb backups to NIM and scripted sudo access provisioning across many servers
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