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2. RAID 1
RAID 1 is called disk mirroring. The principle is to mirror the data of one disk to another disk, which means that when data is written to one disk, it will generate a mirror file on another idle disk without affecting performance. To ensure the reliability and repairability of the system to the maximum, as long as there is at least one disk in any pair of mirror disks in the system, it can be used even when half of the hard disks have problems. When it fails, the system ignores the hard disk and uses the remaining mirror disk to read and write data, which has good disk redundancy. Although this is absolutely safe for data, the cost will also increase significantly. The disk utilization rate is 50%. In terms of four 80GB hard drives, the available disk space is only 160GB. In addition, the RAID system with hard disk failure is no longer reliable, and the damaged hard disk should be replaced in time, otherwise the remaining mirror disk will also have problems, and the entire system will crash. After replacing the new disk, the original data will take a long time to synchronize the mirror. The external access to the data will not be affected, but the performance of the entire system will decline. Therefore, RAID 1 is mostly used to save critical and important data.
RAID 1 mainly implements disk mirroring through secondary read and write, so the load of the disk controller is also quite large, especially in an environment where data is frequently written. In order to avoid performance bottlenecks, it is necessary to use multiple disk controllers.
It is better to use disk mirroring. |
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China
Post time: 2020-2-20 13:00:08
