June 08, 2022

RAID Failure - Common Causes and How to Fix Them

This article will look at the principles of data recovery from RAID arrays in the so-called "simple" cases, using methods available to almost everyone that do not require deep knowledge of computer hardware and software.

RAID Failure - Common Causes and How to Fix Them: eAskme
RAID Failure - Common Causes and How to Fix Them: eAskme

Cases classified as "complex" are too different from each other and require an individual approach, so it makes no sense to describe them in one article.

However, it is possible to discuss a specific situation in a forum section intended for this purpose.

What you should never do to lose data completely?

First, you should not create a new array from old disks hoping that it will start up and work as before.

This may work, but there is a high chance that the controller will perform actions that lead to an irreversible loss of data.

Running initialization will also not lead to anything good, so it is recommended to refuse it, and if this is not possible, use only quick init.

RAID recovery methods:

The main way to recover data from RAID is to build an array image programmatically. Then, blocks from different disks are arranged in the desired sequence.

The order of the blocks in the array depends on the location of the disks on the channels and on the algorithm of the controller itself.

Before you start, it is worth creating clones of all disks to protect yourself from incorrect actions.

Copies can be made as files or directly to other drives.

It's up to you if you decide to work with copies of original files.

However, we strongly recommend using copies because if the source media contains unreadable or unstable sectors, working with such disks can significantly worsen their condition or complete failure.

An alternative to imaging can be a hardware build.

Let's make a reservation right away - without knowing the controller's algorithm or having a backup copy of all the disks in the array; it is categorically not recommended to use this "shamanic method".

You can make such changes to the disks. As a result, you will no longer receive data, even by contacting specialists.

RAID data recovery is an essential step when the drive gets broken.

By ordering RAID Data Recovery Services, you can rely on the help of a dedicated team of RAID data recovery engineers trained to handle all of the current RAID hardware platforms.

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