Shulou(Shulou.com)05/31 Report--

This article mainly introduces "how to repair the hardware failure of raid5 array". In the daily operation, I believe that many people have doubts about how to repair the hardware fault of raid5 array. The editor consulted all kinds of data and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubt of "how to repair the hardware fault of raid5 array". Next, please follow the editor to study!

Server raid5 disk array failure

The server model is P2000 server / raid5 disk array / 10 disks / single disk capacity 1TB/ hot spare disk number is 6, the fault shows that 2 disks in the disk array are offline, indicating a yellow alarm light, the initial check result is that the array disk serial number cannot be read / cannot be recognized by the expansion card, and the disk physical fault is preliminarily inferred.

2.raid disk array data backup

The data recovery engineer of our company's server conducted the initial inspection of the faulty equipment and found that the fault of the disk array was complex, so it was necessary to use different methods to deal with the normal hard disk and the offline hard disk. The normal disk in the raid array could be mirrored and backed up with the help of data recovery software, while the offline hard disk with physical failure needed to repair the hardware failure and then back up. The common disk fault repair method was power-on detection. Judge whether the faulty hard disk starts or not and whether the magnetic head can be found, and then through the common hard disk data recovery methods such as cleaning HDA oxidation assembly, replacing ROM chip, replacing magnetic head and so on. However, in the actual data recovery process, the hardware damage of one disk can not be repaired, so the data can only be backed up and restored through another disk.

3. Data recovery is carried out by reorganizing the RAID5 array. Determine the starting sector

Open all 9 disks that do not include hot spares through the data recovery tool and parse the mirror file into disks. It is found that the 0 sector of all disks in the raid5 array appears as "55AA", and the display "05" at 0x01C2H represents an extended partition. The MBR partition is incorrect. Continue to search the array in another disk and found that the MBR partition of one disk is normal (the value at 0x01C6 represents the head of the next sector pointed to GPT), it can be concluded that the disk is the first hard disk, and the sector where the GPT partition is located starts from sector 172032, so it is preliminarily determined that the starting sector of LUN is 172032 sector.

3.2. Determine the stripe (stripe) size of the raid array

Stripe (stripe) is the basic unit used for data processing in raid disk array. The size of stripe is affected differently by raid disk array. The analysis of stripe size is based on the fact that each stripe group in raid5 disk array contains a check area of the same size. Therefore, the query analyzes that the stripe size in the raid array is 1024 sectors.

3.3 determine the disk array disk order

Since it has been analyzed that the stripe size of the array is 1024, it is divided according to this law so that each stripe is the same size as the record and all disks in the array jump to 283123. Then, by comparing and analyzing the direction of the raid5 array, the first hard disk that has been analyzed can be put in the first place. The actual sequence of the array disk is 9-3-10-4-2-1-5-8-7.

3. Reassemble RAID array

Reassemble the raid array with the data recovery tool with the attribute raid5/Stripe size 512KB/ left async. Data verification can be carried out after the array reorganization.

4. Data validation / raid5 data recovery successful

The data verification of the reassembled array is successful, and the data recovery is successful.

At this point, the study on "how to fix the hardware failure of raid5 array" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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