This page guide you to recover files from RAID array because of RAID hardware failure, RAID controller failure, RAID drive failure, formatting, etc.
RAID is a method of combination of a few hard drives into on inexpensive disk, which provides fault-tolerance for data storage. RAID array provides safer solution for data storage than basic hard disk to protect against data loss, but the loss is usually huge and serious once there is any problem with RAID array.
Data stored on RAID array probably gets lost due to human mistake, RAID failure and system problems and more:
We will introduce data recovery solution for RAID at first, and then we will introduce solution for all common RAID failures later in this article.
For any reason that causes RAID data loss, iCare Data Recovery Pro offers a good way to retrieve files from RAID.
Step1. Free download and install this software, and then launch the software and select a proper scan mode.
Step2. Find the disk from which data got lost and then the software would scan it for lost files. Patience is needed in order to find all lost files.
Step3. You are allowed to preview files and then save the files you need.
RAID array is available in different levels, which has their own advantages and disadvantages. iCare Data Recovery Pro supports every level of RAID for file recovery:
RAID 0 is the most basic RAID level, which can be created by 2 hard disks at least. RAID 0 stripes data, but it does not provide data redundancy and fault tolerance. The advantage of RAID 0 is that it offers high read / write performance and is able to increase the disk capacity. For example, if you create a RAID 0 array with 2 hard disks both have 80GB capacity, the capacity the RAID disk can be 160GB. The disadvantage of RAID 0 is, if one of hard disk in the array is corrupted, it will have influence on the system. Thus, the data stored on the disk runs risk of being corrupted or lost.
RAID 1 provides disk mirroring, which is able to mirrored data from one disk to another. RAID 1 is created by 2 hard disks at least. When on disk is corrupted in the array, it does not affect the data on the other disks. RAID 1 provides fault-tolerance, but the capacity utilization is only 50%. In other words, if you add 4 hard disks which have 80GB capacity to create RAID 1, the available capacity is only 160GB.
RAID 2 provides error-correcting coding, which stripes data from one disk to another. The speed of data read and writing in RAID 2 is slow.
RAID 3 needs to be created by 3 hard disks at least. It provides a safe solution for data storage, but the speed is also slow.
RAID 4 array stripes data at block level, which has a good performance of read / writing data.
3 hard disks are needed at least to create a RAID 5 array, which provides data striping at byte level. Today, RAID 5 is one of the most frequently used array by different enterprises.
RAID 6 is created by 4 hard disks at least, which provides good data redundancy. It stripes data at block level with parity data across all disks in the array.
RAID 10 is combination of safety of RAID 1 and performance of RAID 0. It provides high read performance, but its capacity utilization is only 50%.
RAID array seems to offers better solution for data storage, but it still causes data loss due to different RAID failures, including:
When RAID array has any failures, here are some possible reasons:
When RAID array has any problem, you can do following things:
1. If RAID disk shows off-line, you can perform online operation (If system does not warn message saying rebuild the array, it usually does no harm to the data on the array. On the contrary, if system says needs to rebuild array, it probably causes data loss).
2. Replace the corrupted hard disk with new hard disk and rebuild the array.
3. Replace new RAID card
Please recover all data from RAID before rebuilding array or performing any other operations to repair the RAID failures.
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