A USB drive that’s mounted as read-only is frustrating — you can read files but can’t write, delete, or modify anything. This usually happens due to filesystem issues, hardware problems, or missing drivers. Check the Current State First, identify how the drive is mounted and what filesystem it uses: lsblk -f Look for your USB…
fdisk -l displays partition information in sectors by default, which isn’t practical for most sysadmin tasks. While fdisk itself lacks options to change the unit display, parted shows partition sizes in GB/MB/KB automatically and is the better tool for this job. Using parted for readable partition output Run parted with the -l flag to list…
Understanding the difference between reliability, durability, and availability is critical when designing or operating distributed storage systems like HDFS, Ceph, or cloud object storage. These terms are often confused, but they address distinct concerns. Durability Durability answers: If the system fails completely, will my data survive? Durability is about persistence to non-volatile storage. Data is…
When running Hadoop on systems with substantial memory, the default 1GB heap size is often inadequate. If you check running processes with ps aux and see -Xmx1000m, you’re working with the default configuration that doesn’t scale to modern hardware. Understanding Hadoop Heap Configuration Hadoop’s Java process memory is controlled by environment variables set in configuration…
Windows Disk Management has built-in limitations for resizing partitions — it often won’t let you extend the C: drive even when unallocated space exists on the disk. If you’ve hit that wall, third-party partition tools can handle the job more flexibly. Why Disk Management Falls Short Disk Management can only extend a volume into adjacent…
Eclipse CDT has evolved to handle CMake projects effectively. The key is understanding which approach fits your workflow — native CMake integration (recommended for 2023+ versions) or generating build files. Native CMake Integration (Recommended) Eclipse CDT 2023 and later include robust native CMake support. This is the simplest approach for new projects or when you…
Accessing Linux filesystems from Windows is useful when dual-booting, migrating data, or recovering files. Read-only access is essential to prevent accidental corruption of ext4 metadata and data. Why Read-Only Access Matters Ext4 is designed for Linux environments. Windows drivers lack complete understanding of ext4 journaling, extended attributes, and other advanced features. Writing through an incomplete…
SQL layers abstract traditional relational query interfaces over distributed NoSQL and big data systems, enabling applications to leverage SQL’s familiarity while benefiting from horizontal scalability. Here are the key approaches and systems that have emerged in this space. Distributed SQL on Key-Value Stores Phoenix (Apache Phoenix) provides a SQL interface over HBase. It compiles SQL…
ASP.NET Core remains one of the most efficient frameworks for building scalable web applications. This guide walks through deploying an ASP.NET Core MVC application to Azure App Service using Visual Studio — the quickest path from local development to production. Prerequisites You’ll need: An active Azure subscription (free tier accounts work fine for testing) Visual…
SSD storage is standard across modern hosting providers. DreamHost and competitors have shifted entirely to SSD-backed shared hosting. The marketing claim of “200% faster page loads” deserves skepticism, but SSD-backed hosting does deliver measurable I/O improvements for realistic workloads. This post covers practical performance measurement techniques on a shared hosting account where you lack root…
Shrinking an ext4 filesystem on LVM is riskier than expanding—it requires the filesystem offline and careful size planning. The operation can take hours on large volumes, and mistakes can destroy data. This guide walks through the safe path with verification at each step. Prerequisites Before starting: Backup everything. A full backup of the data being…
GPT (GUID Partition Table) is required for disks larger than 2TB. The older MBR format maxes out at 2.2TB due to 32-bit sector addressing. Tools like fdisk will refuse to work properly with large drives and recommend switching to GPT. While parted has a steeper learning curve than some alternatives, it’s the standard for GPT…
Hadoop 2.x reached end-of-life in 2016. This guide covers setup for learning purposes and legacy system maintenance only. For production deployments, use Hadoop 3.x or later, which includes performance improvements, better YARN scheduling, HDFS erasure coding, and improved security. Cloud-managed options like AWS EMR, Google Dataproc, and Azure HDInsight eliminate most operational overhead. This guide…
LVM abstracts physical storage into logical volumes, letting you resize filesystems online, add drives transparently, and manage capacity without downtime. This guide covers the most common task: extending a mounted ext4 filesystem when you need more space. Prerequisites Online extension requires the resize_inode option enabled on your ext4 filesystem. Check this first: tune2fs -l /dev/vg/lv_home…
A file-backed VBD stores the entire VM disk in a single file on the Dom0 filesystem. This approach works well for testing and development, though LVM-backed or disk-backed storage provides better performance for production workloads. Create a working directory and a 20GB sparse file-backed VBD: mkdir -p /home/xen/f41install cd /home/xen/f41install dd if=/dev/zero of=./vmdisk0 bs=1k seek=20480k…
rclone is the modern standard for mounting Google Drive on Linux — it’s actively maintained, handles authentication reliably, and works across distributions without compilation. Install rclone Most distributions package rclone. Install via your package manager: # Debian/Ubuntu sudo apt install rclone # Fedora/RHEL sudo dnf install rclone # Arch sudo pacman -S rclone Or install…
GNOME Classic is a session mode that provides a traditional desktop experience with an application menu, places menu, and window switcher. It’s useful if you prefer a layout closer to GNOME 2 or want a traditional taskbar-based interface instead of GNOME Shell’s Activities overview. Installation The gnome-classic-session package isn’t installed by default. Install it with…
A failed BIOS flash can leave your HP Compaq laptop completely unresponsive — white screen, no boot, just LED blinking. Before declaring it dead, try HP’s built-in crisis recovery mechanism. This procedure has recovered many laptops that appeared permanently bricked. The process works even when CMOS corruption prevents normal startup. You’ll need a USB flash…
fclose() closes a file stream and disassociates it from its underlying file descriptor. It’s part of the C standard library, defined in <stdio.h>. #include <stdio.h> int fclose(FILE *stream); When called, fclose() flushes buffered output, closes the file descriptor, and deallocates the FILE structure. The function works with both input and output streams. After fclose() returns,…
Dropping file system caches reclaims memory for applications. Linux kernels 2.6.16+ provide a /proc/sys/vm/drop_caches interface to trigger cache eviction. This is safe — the kernel only frees clean cache pages and unreferenced inodes/dentries. Dirty data stays in memory until explicitly synced to disk. Two-Step Cache Drop Process Step 1: Sync Dirty Data to Disk Before…