Fault Description:
As Raid card hardware failure, resulting in four groups Raid5 in the three groups on the system can not be identified. Array of data is very important, even if the replacement Raid card, re-configure the raid information, and it does not guarantee data security. After further reflection, the customer decided to find a relatively safe ways to bring the data back out, and then decided to replace the hardware devices.
Solution:
The face in front of 42 from the array of pull down the size of the optical interface for the 146GB hard drive, technical engineers, if not a wealth of experience and deep knowledge of data recovery, one can not calm themselves, and second, convince customers. Escort age boys calmly took over the project.
The first step to determine the disk drive from the 1-42 group number, the first group, second group, the third group of faults Raid5 composed by 14 disk. Each raid of 14 tray is not a node 14 disk, but the number of nodes in the disk are, fortunately hardware engineers in the configuration when the raid made a detailed record of 42 provinces from the disk analysis which is a group of 14 disk raid5 time, raid5 disk group to confirm successful completion.
The second step, analyzing the data toward the bottom of this step is raid data recovery the most critical step in, if you analyze data from a group of raid5 combination of laws, the other two groups also turned out in a matter of course. With experience in the future, raid5 is the most common and relatively easy to analyze, which unlike the HP RAID ADG, Raid1 + e, Raid1 extended so as hard. Engineers quickly analyze the data combination of the law.
The third step, re-analysis of the data if the data is a key step toward the case, then the reorganization of data is the core technology. Fly-off data recovery with independent intellectual property rights of flight passenger data reorganization Raid software, any one can be re-Raid data. Some data recovery companies Whenever an algorithm is more complicated raid, with the market data recovery software can not do, they think can not be repaired. The fundamental is the non-professional skills, with the second-rate or free of foreign cracked version of the data recovery software to restore the high-end raid failure, can only be luck, there is no theoretical and technical support. Flying off raid recovery technology, which in theory can prove that the failure was incorrigible, and which can not be saved in.
Problems encountered in actual operation:
Days of unpredictable things can happen, people have good and bad fortune overnight. In the RAID data recovery process, the data not displayed in your eyes before you do not say OK, because there are more uncertainties in the head. Had thought that the first group fail raid re very smoothly, and did not expect that there is a 14 disk drive identification is not normal, then we lack in this block of disk data reorganization, did not expect that, when combined to the 70GB disk found in a large number of physical or bad Road, we can only terminate the program. When they find out there are two raid5 and two or more physical disk failure occurs, data recovery to this stage of people’s emotions is the most depressed and hard to endure. But the rule of thumb, we decided to have bad sectors on the hard disk to be a separate image, and then re-image files. If nothing works, we can only repair disk does not recognize a piece of. Finally overcome all the difficulties and successfully recovered all the data.
Summary:
In the high-end storage device fails, we must first think of the importance of data, in fact, this is a sense of thinking and a backup. If the data is very important, we recommend that do not make any exaggerated faulty equipment operation (refer to Rebuild, initialization, synchronization of data, re-equipped with raid, etc.), these operations are more fatal, is not reversible. To seek a professional data recovery company, to provide you with a reasonable recovery program, you can rest assured that your hard drive sent to the operating table. Those non-professional company, if asked to provide an array card or resume the server to do so, you should consider its technical reliability.
