How many hard drives do raid5 need?

raid5 requires at least 3 hard disks. RAID5 stores data and corresponding parity information on each disk that makes up RAID5, and parity information and corresponding data are stored on different disks. , complete data is stored on any N-1 disks; when reading the written data, the data content will be read from 3 hard disks respectively, and then verified through the verification information.

The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

How many hard drives are needed for raid5?

At least 3. RAID5 stores data and corresponding parity information on each disk that makes up RAID5, and parity The verification information and corresponding data are stored on different disks, and complete data is stored on any N-1 disks.

Therefore, when a disk in RAID5 is damaged, the integrity of the data will not be affected, thus ensuring data security. When the damaged disk is replaced, RAID will automatically use the remaining parity information to reconstruct the data on the disk to maintain the high reliability of RAID5.

#When reading the written data, the data content will be read from three hard disks respectively, and then verified through the verification information. When one of the hard drives is damaged, the data content of the third hard drive can be calculated from the data stored on the other two hard drives.

That is to say, the storage method of raid5 only allows one hard disk to fail. When a failure occurs, it needs to be replaced as soon as possible. When a failed hard drive is replaced, the data written during the failure is re-verified. If another block breaks before the fault is resolved, it will be catastrophic.

Storage: RAID5 stores data and corresponding parity information on each disk that makes up RAID5, and parity information and corresponding data are stored on different disks respectively, among which any N- Complete data is stored on one disk, which means that there is space equivalent to the capacity of one disk for storing parity information.

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