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  • Thumbnail for GitHub Action Gotchas

    GitHub Action Gotchas

    I started with GitHub Actions a couple years ago. Recently I came across a few interesting use cases while I was trying to setup Terraform…

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  • EMC Isilon storage product

    EMC has several product lines for different use cases in enterprise data storage. Like may other IT solutions, the website is clouded with marketing terms…

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  • Performance Analysis

    Overview In 2015, Brendan Gregg posted two great articles on Netflix blog: Linux Performance Analysis in 60 seconds, and Linux Perfomrance Tools. They have great…

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  • Balloon steals memory from virtual machines

    This article is my experience with memory balloon on virtual machine. I came across an ElasticSearch server (ESXi guest with 32GB physical memory) where the…

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  • How memory usage adds up in Linux

    There are too many metrics that describes some aspects about memory in Linux. This posting will make sense of those common metrics in Linux, CentOS…

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  • Storage Nitty-Gritty 1 of 5 – Disk and RAID

    On my trip I have been through several pre-sales discussions on storage. Therefore I’m taking this opportunities to write up a series of postings deep…

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