Media information: 6 RAID5 hard drives made by Seagate hard drive, hard drive model: ST31000640SS, capacity: 1T
Customer Name: Beijing Advertising Co., Ltd.
Fault description:
The raid5 server data could not be read. The operation and maintenance personnel found that the disks No. 3 and No. 5 were lit yellow. After restarting the machine, the third disk was online, but the system still could not be started. Then take the No. 5 disk and replace it with a new one, ready to try to synchronize, and the synchronization fails.
Data recovery process:
1. Dash raid data recovery senior engineer tests all member disks to determine whether there is a physical fault;
2. Data recovery of all member disks after repairing the failed hard disk to further ensure the security of the original data;
3. Perform data underlying analysis on all the data that is mirrored to determine the RAID combination mode;
4. Use Dass recovery data recovery self-developed software D-recovery for RAID for virtual recombination of data;
5. Due to the large amount of data, the engineers spent 2 days to finally extract 3.4TB of data, which was completely consistent with the customer's verification data.
Data recovery results: 100% success in data recovery
This data recovery case is difficult:
The RAID5 combination divides two LUNs. The first LUN is 1.8TB in size and contains two partitions. The remaining one is the last partition. When combining, you need to manually confirm the starting sector of the second LUN.
Advice to customers:
1. When one or more disks are disconnected, remember not to blindly perform on-line online, synchronous rebuilding, etc. These operations are too risky. In severe cases, all data may be completely destroyed and cannot be recovered.
2, usually do a good job on the raid server maintenance, timely identify problems and handling, and replace the faulty hard disk in time.
3. After the Raid array is abnormal, do not rebuild Raid, forced online or forced reorganization. These operations may result in permanent data loss.
4. Non-professionals should not disassemble or replace the Raid module. Improper operation may cause damage or coverage to the data in the hard disk, causing serious damage.
5, raid crash data when not in time to find a professional formal data recovery company to do data recovery, so as not to cause significant loss of data permanently lost.
6, Darth data recovery, specializing in high-hard disk, raid server, database and other data recovery. Beijing data recovery senior brand.
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