RAID 1 often called a mirrored array, utilises a pair of hard disk drives to provide 100 percent data redundancy by ensuring both drives contain the same data, known as mirroring. Despite hard disk drive prices being low, it is rarely seen outside of enterprise solutions, often used for high dependency systems, which are required to run 24/7.
Mirrored arrays are being seen ever more frequently for data recovery, which is because of a couple of factors discussed below. The DiskEng data recovery specialists have extensive experience in recovering data from mirrored RAID 1 systems most usually required following the failure of both disks in the array.
Data Safety Essential
The second disk stores a mirror copy of the data which ensures the highest level of data redundancy possible with a RAID array. Although it halves the potential storage capacity, using a RAID 1 array has little or no drawbacks over using a single disk, despite the requirement to write the data to two drives. Data transfer speeds when reading data may in some cases may see a small increase.
The price per gigabyte of data has dropped rapidly, making the use of RAID 1 architecture more attractive, a significant reason for a corresponding increase in data recovery requirements. Using this type of RAID in high dependency servers may be highly beneficial, but a backup plan should still be implemented in order to guard against any potential failure.
RAID 1 Re-mirror
A RAID array will remain operational following the failure of a single disk, at which point it will run in degraded mode. When a hard disk fails should always be replaced with a new one as soon as practicable, so that the data from the working drive can be re-mirrored.
Data transfer speeds have increased considerably, but at the same time overall capacities of hard disk drives has correspondingly increased. This means that re-mirroring will take a considerable length of time, at which point the data is vulnerable. If you source both hard disks from the same supplier at the same time for use in a RAID 1 array, the possibility of the second drive failing shortly after the first is significantly high. Due to the significantly increased time taken when re-mirroring modern hard disks we are starting to see a rise in the number of RAID 1 arrays which require data recovery.
Data Recovery RAID 1
If your RAID 1 array suffers a failure, which usually occurs during the re-mirroring process, it is important that you do not panic. It is important that both of the original hard disk drives used in the RAID 1 array are sent for professional data recovery. If the failure became apparent during re-mirroring it may be beneficial to supply the new hard disk drive onto which the data was being copied, as important data, vital for achieving a successful data recovery may be contained on the drive.
If the hard disk drive which initially failed is not too far out of date, it can be used by our data recovery specialists to rebuild a fully working array in the event of encountering bad sectors on the other drive. Data loss is only likely to happen in the event of both drives containing the same unreadable bad sector or when the failure of one drive is not acted upon immediately.