RAID Array: Degraded Mode
Here you will find out:
- what is degraded RAID array
- about degraded array events
- when DiskInternals can help you
Are you ready? Let's read!
Degraded RAID array mode
It is known that arrays with data redundancy can undergo various kinds of failures.
If, as a result of a failure, one of the disks is damaged, the array switches to “degraded mode”. In this case, when the RAID is degraded, the array can continue to work, but with a significant decrease in performance. The controller puts the array into degraded mode automatically when it sees that an error has occurred with one of the disks.
If you are dealing with a degraded RAID array, keep in mind that the array can be restored to its normal state by replacing faulty hardware.
DegradedArray events and minus-one drive from RAID array
A DegradedArray event happens when a drive is permanently removed from a RAID array.
When a RAID disk fails, you usually get a message about this:
DegradedArray event was detected on device md dev/md/1.
From that message, you can understand what kind of array has been removed; in this case, /dev/md/1 (or dev/md/2).
Also, in this message you can find the expression:
MD1 is active and uses raid1. The array is built from sdb3 and sda3.
The symbol [U_] means that one of the drives is out of sync. In this case, sdb3 is a bad drive because it is marked (F).
How to restore RAID data after a DegradedArray event
Data can be restored using DiskInternals RAID Recovery with only a few clicks of the mouse button.
Click on the RAID Recovery button and then re-save the data to external storage.
Use Uneraser recovery mode if some data has been deleted.
DiskInternals RAID Recovery automatically restores an array from available hard drives with a drag and drop interface, and determines the correct type and size or array, as well as the order of the drives. RAID Recovery uses advanced algorithms that allow you to recover all types of files (documents, images and multimedia).
No special technical skills or programmer education are required to repair damaged RAID arrays. If you have any questions, the Recovery Wizard will help you right away. If this is not enough, contact the support team and the company's specialists will immediately help you. You can export files to another hard drive or partition, upload files via FTP, or use virtual disks.
You can also apply the recovery algorithm in case of loss with DiskInternals RAID Recovery, so you will feel more confident in your abilities.
Download and install the application.
As soon as the application is open, it automatically (using the Recovery Wizard) recognizes the array and other key indicators.
Select the RAID you want to scan and the scan mode (full or quick).
Then wait for the results and view them for free using the appropriate function.
After that, purchase a license online and export the data. Select the drive by first connecting it to the computer.