Shulou(Shulou.com)05/31 Report--

Hello, everyone. Lin Fei has come to answer the above questions for you. Many people don't know raid 1 Magi raid. Now let's take a look at it.

1. Raid is the English name of disk array. The so-called disk array is to combine many disks according to the number of groups into a large disk group, similar to the hard disk. We can model and partition it. Of course, in addition to these cheap disk groups, there are separate disk groups, called redundant arrays of independent disks.

2. The earliest raid mode is raid0, and now there are eight basic raid levels from raid0 to raid7, as well as raid0 1 (also known as raid10) and raid53. Raid is the lowest and simplest one in raid, and the cost is relatively low. Although the capacity of the hard disk can be increased and the speed is very fast, once any hard disk fails, it will drag down the whole system and destroy it at once. Compared with raid0, Raid 1 has higher security and the same speed. RAID 1 combines the advantages of raid0 and raid1, which is both safe and fast.

3. Raid 2 and raid3 have something in common because they both distribute data on different hard drives. Both raid3 and raid5 use the check method. Raid3 uses a disk to store parity data, and raid5 uses a disk to check the data generated by each disk and cuts it into blocks to store in the disk array. Although the speed will slow down, it can alleviate the bottleneck when checking the data. Raid01 and raid5 are commonly used at present. Raid 4 is similar to raid3 and its characteristics are similar to raid3, except that the former is more difficult to fix in the event of a failure. Raid6 is developed on the basis of raid5, the data accuracy is high, but the complexity is slow, and there are few people to use it. RAID has a cache on every disk, so data access is fast and expensive.

4. The disk array has the style of external disk array cabinet, which is suitable for large servers with high price. The relatively cheap model has built-in disk array cards, which are suitable for technicians. There is the style of software simulation, which is easy to drag down the efficiency of the machine.

5. During use, the disk array may fail, so we need some data recovery techniques. The method is as follows: first, do a mirror image, make an image file for each hard disk, and store it in another space. Secondly, the image file is analyzed, and then the analyzed data is reassembled by the software, and then stored in another disk array space with enough space. Finally, restore the recovered data to the oracle environment and validate it wholeheartedly.

At the end of this article, I hope it will be helpful to you.

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