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Most people don't understand the knowledge points of this article "how to deal with raid disk array OFFLINE", so Xiaobian summarizes the following contents for everyone. The contents are detailed, the steps are clear, and they have certain reference value. I hope everyone can gain something after reading this article. Let's take a look at this article "how to deal with raid disk array OFFLINE".

Redundant Arrays of Independent disks (RAID) means "arrays of independent disks with redundant capabilities." A server disk array consists of a large number of inexpensive disks grouped into a large disk set, which uses the additive effect of the data provided by individual disks to improve the performance of the entire disk system. Using this technology, data is divided into many segments and stored separately on each hard disk.

Disk arrays can also utilize the concept of parity check, which allows data to be read in the event of a failure of any disk in the array, and to be calculated and re-placed into a new disk when data is reconstructed.

Many companies are using RAID disk arrays for data storage, so they will encounter different failures that lead to disk array data loss. After the array fails, you must operate correctly to recover disk array data. Here's how you can take remedial action after a server disk array failure.

[This option applies]

IBM, HP, SUN, DELL, DFT, APPLE, Lenovo, Founder and other brand servers;

RAID0, RAID1, RAID2, RAID3, RAID4, RAID5, RAID6, HP ADG, RAID10, RAID50, RAID1E, RAID5E, RAID5EE, etc.

NAS, DAS, SAN, etc.

[For which disk array failures]

1. RAID console describes abnormal disk number exceeding allowable range, such as more than one disk in RAID0; more than 2 disks in RAID5(no hot spare); abnormal performance is OFFLINE or DDD, BAD, etc.

2. Server storage system alarm (horn or warning light)

3. The system cannot recognize RAID logical hard disk

[Emergency Response]

1. Quickly take RAID offline (if still online) and cut off power

2, if found non-working state, hard disk lights are busy, should quickly turn off the power, can not turn on the power again.

3, RAID control interface can not be easily REBLD or initialization.

4. Do not force the original offline hard disk online (old or irrelevant)

5. Keep the above state, and label each hard disk in order after shutdown.

6. Do not easily connect each disk to the following operating system XP (including XP).

Seek help from a professional data recovery company.

[Advanced recommendations]

If you have enough spare space, you can mirror the entire source hard drive. There are two ways (Windows2003 or DOS, other operating systems are at risk):

1, can be the same as or larger than the source disk capacity of the hard disk as the target disk, the source disk all sectors CLONE mode to the target disk. Do the same for all disks.

2. Each source disk can be completely exported to a large capacity storage space (such as large capacity hard disk, NAS, SAN, DAS, etc.) in sector mode.

The above is about the content of this article on "how to deal with raid disk array OFFLINE". I believe everyone has a certain understanding. I hope the content shared by Xiaobian will be helpful to everyone. If you want to know more relevant knowledge, please pay attention to the industry information channel.

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