What is Write and LVM in Linux?
In the vast world of Linux, knowing how to effectively manage storage is essential. Write and LVM functionality are two powerful tools for managing disks efficiently and robustly. I'll walk you through the basics of each so you can understand their importance and use in real-world situations.
What is Write?
Write, short for "Redundant Array of Independent Disks", is a way to build a disk system that guarantees redundancy. Although it is not exactly a backup, since its main function is not to store data in multiple locations, Write ensures that if a disk fails, your data will not be lost because it will have been duplicated on another disk.
- Redundancy but not backup: Unlike a backup, Write creates internal redundancy. A backup would move the data to another location allowing you to restore previous versions.
- Types of Write: There are several types of Write (0, 1, 2, up to 5 and combinations), but the most common is Write 1, which duplicates the information on two disks.
Write 1 example:Suppose you have two 5 GB disks. In a Write 1 scheme, the same information on one disk is mirrored on the other. Although your system will see only 5 GB of usable space, your data will be safe if one disk fails.
What is LVM?
The Logical Volume Manager (LVM) is a formidable tool in Linux that offers flexibility in storage management. With LVM, you can dynamically resize and manage partitions, which is extremely useful in server environments.
- Dynamic disk resizing: Unlike fixed partitions, LVM's logical volumes allow you to adjust sizes without hassle.
- Disk pooling: LVM can pool multiple disks so that the system recognizes them as one, improving storage management and scalability.
LVM usage example:With multiple disks, LVM allows you to create a volume that the system will see as a single disk. This gives you the ability to create logical partitions that you can resize as needed.
How to combine Write and LVM effectively?
The combination of Write 1 and LVM can provide both redundancy and flexibility. Ideal for scenarios where storage integrity and scalability are critical, such as servers.
- Deploying LVM over Write: By mounting an LVM over a Write array, we can create and adjust smaller partitions while maintaining data security.
- Case study: Imagine having physical devices commonly referred to as PB (Physical Volumes). These are organized in a Write array. On top of this array, LVM is implemented to allow the creation of private and public partitions that can be adjusted without losing data.
How amazing is this system! It gives us the perfect mix of resiliency and tunability, essential for any critical server operation.
With the knowledge of these concepts, you are ready to move forward and apply what you have learned to real projects! Continue to explore and master these tools to maximize your Linux capabilities.
Remember, the world of system administration is limitless - every step you take leads to more possibilities and challenges!
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