Secure Erase A Drive

I am just about to reinstall Ubuntu 12.04 onto an SSD that I have been using as an extra data storage drive. Before installing the OS onto an SSD, it may be a good idea to "reset" it to peak performance by performing a Secure Erase operation. The first…

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Smartmontools and Smartctl Cheatsheet

Modern storage drives come with the Self-Monitoring, Analysis and Reporting Technology, or SMART for short. This is a monitoring system that detects and reports on various indicators of drive reliability, with the intent of enabling the anticipation of hardware failures. Smartmontools is the package that installs the smartctl command that…

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KVM - Add Disk

I run my virtual machines on SSD storage which is expensive compared to traditional HDD storage. Thus if a virtual machine needs a lot of storage, such as for a mirror, then I will give it an HDD disk to put the data on. Here's how to do just that.…

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Caches and Data Integrity

Page Cache In Linux, When a normal application wants to save some data the flow usually looks something like this: Linux uses all available memory (RAM) as a cache to speed up your applications I/O operations. This cache is called the "Page cache". Linux does this because writing to…

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Qcow2 Conversion and Snapshotting

If you use Virtual machines, such as within KVM, then you may be running raw disk images. Converting them to Qcow2 will give you some advantages, such as the ability to snapshot your VM. Here we will show you how to: Check your disk file's format to see if it…

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What is RAID?

RAID stands for "redundant array of independent disks", which Wikipedia describes as: ... a data storage virtualization technology that combines multiple disk drive components into a logical unit for the purposes of data redundancy or performance improvement. Why Should I Care? The slowest part of a computer is usually the permanent…

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