Raid is a very efficient and secure storage system. It combines several inexpensive hard disks into a hard disk array, The aim is to make the performance reach or exceed an expensive and huge capacity hard disk.
Benefits of Raid:
- Enhance data integration level.
- Enhanced fault-tolerant ability.
- Increase processing capacity or storage capacity.
According to different needs and budgets, the raid can be divided into many types. Basically, Raid0, Raid1, Raid5, Raid10 are more common. Next, we will talk about the classification of the raid and how to restore raid.
1. Classification of Raid:
Raid 0：
Connect two or more hard disks together to form a large hard disk. The data will be segmented write into these hard disks. Since the data is read by parallel storage, Raid0 does not have fault tolerance, but it will increase the capacity of hard disks and speed of processing.
Raid 1：
Two or more hard disks are mirrored to each other. Data is written to the main hard disk, and the same data will be written to the mirror hard disk. If the main drive is damaged, all data is saved on the other drive. So you don’t lose data. Raid1 has the best fault tolerance, but disk utilization is minimal.
Raid 5:
Raid 5 is made up of more than three hard disks. It divides all the data into blocks and parity blocks and stores them in all hard drives. This will ensure that the data is complete in any N-1 hard drive. Anyone hard disk damage will not cause data loss. Raid 5 is a compromise between Raid 0 and Raid 1, combining fault tolerance and disk capacity utilization. Is currently the most popular solution.
Raid 10:
Similar to Raid 5, both are equally fast in reading and writing data. When one hard drive fails, the data can be recovered smoothly. When a failure occurs, the recovery time for raid 10 is much less than for raid 5. The disk space utilization of Raid5 is higher than Raid 10. In short, Raid 5’s disk space utilization is higher than Raid 10’s, but Raid10’s security is higher than Raid 5’s.
2: What should we do after Raid fails?
Raid has fault tolerance mechanism, which can automatically restore damaged data in some cases. But if it goes beyond the scope, for example, two hard disks on Raid 5 are damaged, the lost data cannot be recovered automatically. At this time, choosing an excellent data recovery software can help you restore the data on raid.
The main reason for the failure:
- The Raid array card fails.
- Disk physical failure, such as bad track, disk error, disk response time too long, raid 5 damage more than 2 disks.
- The array cabinet or server is suddenly powered off without UPS protection.
- After the hard disk sequence is mistaken, start the system, or blindly change the array configuration information.
- Reconfigure RAID disk array information
- The power supply is unstable, resulting in the loss of raid information.
Because the server stores important data. Avoid secondary data damage. Please operate cautiously after a failure. After failure, please turn off the power immediately, contact the server aftermarket center as soon as possible to ensure data security. Don’t do rebuild reorganization after array information is lost. Of course, it is absolutely safe to use iFinD Data Recovery for data recovery.
3: How to recover lost data on Raid using data recovery software?
Raid has a fault tolerance mechanism, which can automatically restore damaged data in some cases. But if it goes beyond the scope. At this time, choosing an excellent data recovery software can help you restore the data on the Raid.
Now, we guide how to use iFinD Data Recovery to recover lost data on RAID device:
Step1: Download and install the latest version.
Step2: Select the first feature, “Lost Partition Recovery,” and select the Raid you need to restore.
Step3: When the scanning is finished, all the files found will be listed, and the files you need to restore will be saved locally.
Notice: Do not save files on an external hard drive that is being restored. The wrong operation will cause permanent damage to the data, and then, cannot be recovered.
Raid is a very complex storage device, and the data stored in it is also very important. When a fault occurs, the first step should be power off, and contact the equipment supplier, you can try ifind data recovery software to restore. However, due to the unique design of Raid, data cannot be fully recovered occasionally. Therefore, our daily maintenance is very important, we must be very careful to avoid failure.