Interview Question: How to Analyze iostat OutputScenario: Diagnosing Disk I/O Latency You suspect that a disk is experiencing high latency during peak traffic. To monitor real-time disk performance, you run: iostat -y -x 5 3 Output: avg-cpu: %user %nice %system %iowait %steal %idle ...Dec 17, 2024·7 min read
Understanding Slack's January 2021 Outage: A Restaurant AnalogyOn January 4th, 2021, Slack experienced a significant outage that affected millions of users worldwide. While the root cause was traced to degraded AWS Transit Gateways (network connectivity issues), an interesting cascade of events occurred when Sla...Nov 20, 2024·3 min read
The Mystery of if __name__ == '__main__': in Python – Explained with a Post Office AnalogyWhen you're learning Python, stumbling upon the line if __name__ == '__main__': might feel like deciphering a secret code. But trust me, it’s simpler than it seems! This line serves as a gatekeeper, determining whether your Python script should execu...Nov 17, 2024·3 min read
Linux VFS Explained: How It Simplifies File Access Across Multiple File SystemsThe Virtual File System (VFS) serves as an abstraction layer that allows the kernel to interact uniformly with different file systems (ext4, XFS, NFS, etc.). VFS provides a consistent interface for user-space applications to perform file operations l...Nov 17, 2024·3 min read
How to Choose the Right AWS Region: Key Factors and Real-Life LessonsHow to Choose the Right AWS Region: Key Factors and Real-Life Lessons Picking an AWS Region may seem like a small detail at first, but it’s one of the most impactful decisions you can make in setting up your cloud infrastructure. Getting it right me...Oct 28, 2024·4 min read
