RAID plays a good role in data storage, but it would be a greater challenge if the array fails and internal data get lost. This article will focus on RAID data loss issue and outline the 5 common causes.
So-called “RAID” commonly refers to redundant array of inexpensive disks. It is a virtualization technology for data storage. It can combine many physical disks or drives into a single logical unit to realize data redundancy and improve related devices’ performance.
This technology indeed makes our data more secure due to the redundancy. But it is because the array involves several hard drives that once failures or disasters occur to the array, recovering its lost data will be much more complex. Therefore, it’s highly suggested to keep more than one copy of your critical data offsite. For example, back up the PST files on the cloud. In this case, even if the array fails, you can recover Outlook data from the cloud with ease. Due to the fact that RAID is made up by hard drives, it is equally vulnerable to the drive. So in order to prevent data loss from RAID failure, you should figure out the common causes. Here we list out 5 of them.
1. RAID Controller Failure
RAID controller is the component which manages all of the combined hard drives in the system. Therefore, once the controller fails, you will be definitely unable to access the drives as well as the data contained on the drives. This kind of failures can occur from sudden power surges or other problems. At this point, rebooting the RAID will be likely to overwrite the data.
2. Physical Damages
As we’ve introduced above, RAID is made up by hard drives, which are prone to damages. Hence, if the hard drives in the array suffer physical damages or other types of misuse, the internal workings of the RAID will get affected and then data may be lost. A common consequence of hard drive physical damages is the drive head damages. Under this circumstance, heads will get direct contact with drive platter and then make much more wear and tear on the drive. Drive fails and the array will fail subsequently.
3. Circuit Board Corruption
Moreover, when the circuit board on the hard drive gets damaged, the drive will malfunction as well. Undoubtedly, the overcome must be RAID failure and RAID data loss. In this scenario, if you think that replacing the board can resolve it, you must wrong. Each hard drive has its own unique ROM chips. Replacing can not only solve the issue but also make it worse.
4. Improper Rebuild of RAID Volume
Assuming that a RAID volume is rebuilt incorrectly, something wrong will occur in accessing data. In worse situations, it can lead to an entire system breakdown. There are multiple types of improper RAID rebuilds, such as rebuild RAID with missing hard drive, with different configuration or with out-of-order drives, etc.
5. Accidental Deletion
Of course, like computer data loss, RAID data loss can stem from human errors, one of which is accidental deletion. Actually, as long as you haven’t written new data, the mistakenly deleted data can be restored with ease. But more often than not, most laymen don’t know this principle. Once the data gets overwritten, it is impossible to recover them.
Shirley Zhang is a data recovery expert in DataNumen, Inc., which is the world leader in data recovery technologies, including repair SQL Server database error and outlook repair software products. For more information visit www.datanumen.com