1. provides disk spanning function by organizing multiple disks into a logical volume.
2. Provide fault tolerance through mirroring or verification operations.
3. By dividing the data into multiple data blocks, write/read data to/from multiple disks in parallel to improve the speed of accessing the disks.
In the process of using RAID devices, we often encounter some common failures. Besides the application of massive storage space, these failures also bring us many unpredictable data risks. Data recovery experts from Das in Beijing introduced the basic solutions to common problems.
RAID is broken, be careful.
1. After data is lost, users should never write to the hard disk. Instead, they should number and disassemble the hard disks in sequence, and use the disk mirroring tool to make each hard disk into a mirror file. This process is best handled by a reputable data recovery company.
2. It is best to find a professional data recovery company to replace the new model (made in the past year), otherwise the RAID may be initialized automatically after card replacement.
3. Don't rebuild, force online, initialize and other dangerous operations on Raid. Otherwise, the data may be completely destroyed.
4. Don't try data recovery without understanding (this kind of problem is the most common in many data disasters). IT executives in many enterprises personally destroy data. This is not an alarmist. I hope you can consult an expert before making a plan.
Analysis of common Raid failures and recoverability given by Topster in Beijing
1, logic failure:
A. RAID data recovery due to information loss or damage of RAID disk array caused by sudden power failure.
B. The system can't recognize the data because the disks are out of order.
C. recovery of data loss caused by information reconfiguration of C.RAID array.
D error deletion, error formatting, error partition, error cloning, file decryption, virus destruction, etc.
2. Hardware failure:
A. One or more hard disks in RAID are damaged, resulting in the loss of RAID information and data crash.
B. There are bad tracks on the hard disk, resulting in data reading errors.
C.c.RAID controller failure leads to data loss.
The user's handling method after failure directly affects the success rate of RAID data recovery.
RAID has a basic concept called EDAP (Extended Data Availability and Protection), which emphasizes scalability and fault-tolerant mechanism, and is also the focus of attention of various vendors such as IBM, HP, Compaq, Adaptec, Infortrend, etc.
Include that following action that can be handled without stopping the machine:
RAID disk array supports automatic detection of failed hard disk and alarm;
RAID disk array supports the reconstruction of data lost due to hard disk track damage;
RAID disk array supports hard disk hot standby without downtime.
RAID disk array supports replacing hot plug with hard disk without downtime.
RAID disk array supports the expansion of hard disk capacity.
Once RAID fails, most hardware service providers can only re-initialize or rebuild RAID for customers, so that customer data will not be recovered. Don't perform dangerous operations such as initialization, reconstruction and forced online on RAID and hard disk after failure, and data recovery can basically succeed. With the help of technology and reputable data recovery service providers, it is a data security solution for system integrators, server sales channels and enterprise users.
Recommend the disk array and data storage security solution of Beijing Jiuqiang Chengzhi Technology Co., Ltd. ..