RAID disk Array Data recovery method introduction

RAID disk array devices, which often encounter some common failures during use, also bring a lot of hard-to-estimate data risk beyond the applications that bring us massive storage space. What is the reason for the loss of RAID array information? RAID array card or server failure, system corruption, physical failure of the disk, such as: Circuit board bad, head damage, bad disk, bad sector, bad firmware, sudden power outage, unplug the hard drive will be wrong in sequence, damage to more than 2 blocks of hard drives in the array, reconfiguration of RAID array information, etc. may result in data loss.

Once the RAID disk array fails, do not attempt to rebuild, sync, and so on easily. What is rebuild? Simply put, the rebuild is to generate data for another disk based on the other disks on the line. If the two and more than two disk drop-off arrays will crash, most of the time because one disk is not detected in a timely manner, and so on when the second disk fails the system crashes before processing. If the array after the first block after the write operation, and the first off the disk (first off the line) of the data is "not fresh" = for the past data, then only the first dropped disk to do rebuild, if the after-drop disk reconstruction operations, some arrays although the work, but the data is not correct, Some files cannot be opened, causing irreparable damage to the user.

Never initialize. Initialization is the disk array zeroed out, which is equivalent to the low-level format of the hard disk. Carefully re-provision the disk array information. The reconfiguration of the disk array information is guaranteed to be consistent with the original configuration information, if the configured parameters and the original configuration of the inconsistency, some directories may be correct, but the vast majority of files can not be opened, resulting in data loss. Most servers are automatically initialized after the array information is re-provisioned, and the loss will be very large.

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RAID disk Array Data recovery method introduction