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Today, the editor will share with you the relevant knowledge points about the solutions to common problems in raid. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's learn about it.

Raid disk array is a technology that integrates multiple physical hard disks into one virtual storage. The raid module is equivalent to a storage management middle layer. The upper layer receives and executes data read and write instructions from the operating system and file system, and the lower layer manages the storage, reading and writing of data on each physical hard disk. Compared with separate physical hard disks, raid can provide users with more independent storage space and faster reading and writing speed. Higher data storage security and more convenient unified management mode. The normal operation of Raid disk array is the key to ensure the normal reading and writing of data in the server.

Common features of server raid corruption:

How fast the physical hard drive LED is in the 1.Raid disk array gives an alarm.

two。 The disk array shows that multiple hard drives are offline or missing

3.Raid information is missing, all physical hard drives are no longer in online state

4. Panic when unable to enter the raid management interface or view raid related information.

Analysis of possible causes of disk array failure:

1. A physical failure of a single hard disk in the disk array may result in some damage to the data in the server.

The data transmission channel of 2.Raid is not smooth or the data transmission module is aging, which may lead to data inconsistency in the server.

3. Loss of raid information or damage to the raid module due to server system update, restart, or unexpected power outage of the server. In this case, the server data may be corrupted.

Upgrading the 4.Raid module or reinstalling the system results in the loss or re-creation of raid information, which may result in serious damage to the server data.

5. Misinserting the physical hard drive in the disk array or forcing the hard disk online/rebuild may result in complete corruption of the server data.

Data recovery solution:

First of all, all the non-hot spares in the disk array are fully backed up to the safe storage with redundancy function, and the hard disk with physical failure must first be restored according to the solution of the corresponding fault type. then, as much as possible, the data in the failed physical hard disk is also backed up to secure storage.

Then all the hard disk images of the full backup are analyzed to determine the original structure parameters of the fault raid (raid level, stripe block size, hard disk sequence, data check mode, etc.), and determine the offline condition of each hard disk in the fault raid.

According to the analysis of the raid parameters and the offline situation of the hard disk, the raid data is constructed in the read-only environment, and the basic logical verification of the virtual raid is carried out to determine that the general structure of the file system is correct, and then the raid array is mirrored completely.

Finally, the backup generated raid image for a complete logical analysis and verification, if the file system is still inconsistent, according to the corresponding file system damage solution memory repair, until the migration of the required data.

Recommendations for data protection after Raid disk array failure:

1. Do not bump the hard disk again, any hard disk in the server is very important for data recovery, if the key hard disk is seriously physically damaged, the data recovery work will become extremely difficult or even impossible to complete.

two。 Do not recreate the raid or force the online/rebuild. If there is an early offline hard disk or online synchronization error in the server, the data recovery work will be extremely difficult or even impossible.

3. Do not disassemble and replace the main modules of the fault storage by non-professionals. Improper operation will seriously affect the internal data of the server, or even permanently destroy the server data.

These are all the contents of this article entitled "what are the solutions to common problems in raid?" Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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