Shulou(Shulou.com)06/02 Report--

Disk array (Redundant Arrays of Independent Disks,RAID), which means "redundant array of independent disks". The server disk array is composed of many cheaper disks into a disk group with huge capacity, which uses the addition effect produced by individual disks to provide data to improve the performance of the whole disk system. Using this technology, the data is cut into many sections and stored on each hard disk.

The disk array can also use the concept of parity check (Parity Check) to still read the data when any hard disk in the array fails, and when the data is reconstructed, the data will be calculated and re-placed into the new hard disk.

-the definition comes from Baidu encyclopedia

Many companies are using raid disk array for data storage, so they will encounter different failures that lead to disk array data loss. After the failure of the array, it must be operated correctly to recover the disk array data. The following will introduce for you how to restore data after the failure of the server disk array, and how to recover server data as much as possible.

[this scheme 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.

[applicable to which disk array failures]

1. An exception in the number of disks that exceeds the allowable limit is described in the RAID console, such as an exception of more than one disk in RAID0, an exception of more than two disks in RAID5 (no hot backup), and an exception such as OFFLINE, DDD, BAD, etc.

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

3. The system does not recognize the RAID logical hard disk.

[emergency handling]

1. Quickly take RAID offline (if it is still online) and cut off the power supply

2. If you find that the hard disk lamp is not working, you should turn off the power quickly and do not turn on the power again.

3. It is not easy to REBULD or initialize the RAID control interface.

4. No offline hard drives can be forced online (obsolete or irrelevant)

5. keep the above state, and affix a sequence label to each hard disk after shutdown.

6. It is not easy to connect each disk to the operating system below XP (including XP).

7. Seek help from a professional data recovery company.

[advanced recommendations]

If there is enough spare space, all the source hard drives can be mirrored. There are two ways (under WINDOWS2003 or DOS, other operating systems are at risk):

1. You can use the hard disk that is the same or larger than the capacity of the source disk as the target disk, and CLONE all sectors of the source disk to the target disk. Do the same operation on all disks.

2. Each source disk can completely output files to a mass storage space in sector mode (such as high-capacity hard disk, NAS, SAN, DAS, etc.)

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