Thursday, September 16, 2010

EDI array of 42 disks to restore all 3 groups Raid5 Raiders



EDI6600FF series is a high-performance Fibre Channel storage products, EDI6600FF of a disk subsystem can support 14 disks, when you need more storage capacity, can connect up to 8 sub-systems to achieve the total capacity of 112 drives.

This case is an expansion of the main cabinet and the cabinet composed of the three Group 4 raid5

Fault Description:

As the Raid card hardware failure, resulting in 4 groups Raid5 in the 3 groups on the system is not aware of. Array data is very important, even if replacement Raid card, reconfigure raid information, we can not guarantee data security. After further consideration, the customer decided to find a relatively safe way to back up data and then decide to replace hardware.

Solution:

The face in front of 42 from the array of pull down the size of the optical interface 146GB hard drive, technical engineer without extensive experience and deep knowledge of data recovery, one can not calm themselves, and second, convince customers. Escort age boys calmly took the project.

The first step to determine the hard disk block number from 1-42, the first group, second, third fault Raid5 composed by 14 disk. Each raid of 14 tray is not a node 14 disk, but a few nodes in the set are, fortunately hardware engineers in the configuration when the raid made a detailed record, saving the session from 42 of which is a group of 14 disk raid5 time, raid5 disk group to confirm successful completion.

The second step, a step toward analyzing the underlying data raid data recovery is the most critical step, in fact, as long as the analysis of data from a raid5 combination rules out the other two groups also logical. With experience in the future, raid5 is the most common and relatively easy to analyze, unlike HP RAID ADG, Raid1 + e, Raid1 extended so as a. Engineers quickly analyze the data combination rules.

The third step, re-analysis of the data if the data is a key step toward, then re-data is the core technology. Escort times with independent intellectual property "frigate" Raid data re software, data can be reorganized any one of the Raid. Some data recovery companies Whenever an algorithm is more complex raid, with the market of data recovery software can not do it, is deemed irreparable. It is simply not professional skills, with second-rate or foreign cracked version free data recovery software to restore the high-end raid failure, can only take a chance, there is no theoretical and technical support. "Frigate" raid recovery technology, which in theory can prove fault is incorrigible, and which can not be saved.

Problems encountered in practice:

Accidents will happen, people have good and bad fortune overnight. In the data recovery process, the data have not demonstrated before in your eyes, you must not say OK, because there are more uncertainties in the head. Originally thought that the first group of raid failure re very well, did not expect this 14 plate with a plate identification is not normal, and we are missing data in this block of plate reorganization, combination did not expect to find a 70GB disk, when a large number of physical bad Road, we can terminate the program. When they find raid5 in two and two or more physical disk failure occurs, data recovery to the person's mood at this stage is the most depressing and uncomfortable. But the rule of thumb, we decided to have bad sectors on the hard drive alone to be a mirror, and then re-image file. It is not, can only repair a disk does not recognize the piece. Finally overcome all difficulties and successfully recovered all the data.

Summary:

In the high-end storage device fails, the first thought is the importance of data, in fact, this is a sense of thinking and backup. If the data is very important, we recommend not to make any exaggerated faulty equipment operation (refer to Rebuild, initialization, synchronization of data, to redistribute the raid, etc.), these operations are more fatal, is irreversible. To seek a professional data recovery company, to provide you with a reasonable recovery plan, you can rest assured that your hard drive to send the operating table. Those non-professional company, if asked to provide the array card or server to do recovery, you should consider its technical reliability.







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