RAID0 and RAID5, how much can the speed of ordinary hard disks be improved?

RAID 0: Error-free controlled bands.

To achieve RAID0 there must be more than two hard drives, RAID0 implements bands, and the data is not stored on one hard disk, but is divided into data blocks and stored on different drives. Because the data is distributed across different drives, the data throughput rate is greatly improved, and the load on the drives is more balanced. If you just need the data to be efficient on different drives.

It does not need to calculate the checksum and is easy to implement. RAID can increase the data transfer rate, for example, the files that need to be read are distributed across two hard disks, which can be read at the same time. Then the original time to read the same file is shortened to 1 2.

RAID5: Distributed parity independent disk architecture.

Its parity code is present on all disks, and the readout efficiency of RAID 5 is very high, the write efficiency is average, and the block collective access efficiency is good. Because parity codes are on different disks, reliability is improved. However, for RAID 5, most data transfers are only operated on a single disk, which can be done in parallel.

In RAID 5 there is a "write loss", which means that for every write operation, there will be four actual read and write operations, two of which will read the old data and parity information, and two will write the new data and parity information.

The read/write speed of RAID0 = the number of disks of RAID0 x the read/write speed of a single common hard disk, which is suitable for occasions that require high-speed read/write.

RAID5 read speed = (number of disks in RAID0 n-1) x read speed of a single common hard disk;

The write speed of RAID 5 is slightly lower than the write speed of a normal single hard disk, which is suitable for occasions that require high-speed reads, but do not require high write speed!

RAID 0 does not have redundancy protection and is generally only suitable for temporary data storage. RAID 5 provides redundant protection for the storage of important data!

RAID 1 has n times the read speed of a regular hard drive.

RAID 0 is a simple, data striping technique without data validation. Not actually a true RAID because it doesn't offer any kind of redundancy policy. RAID0 stripes the disks to form a large-capacity storage space, and stores data in all disks in a distributed manner, so that multiple disks can be accessed in an independent way.

Since IO operations can be performed concurrently, the bus bandwidth is fully utilized. Coupled with the fact that no data validation is required, RAID 0 has the highest performance of any RAID class. Theoretically, the read and write performance of a RAID0 composed of n disks is n times that of a single disk, but due to the limitations of various factors such as bus bandwidth, the actual performance improvement is lower than the theoretical value.

RAID 1 arrays are typically slower to write because data has to be written to two hard drives separately and compared. RAID 1 arrays generally support "hot swapping", which means that the removal or replacement of hard disks in the array can be done while the system is running, without interrupting and exiting the system.

RAID 1 is very secure, but it is also a more expensive RAID solution because two hard drives can only provide the capacity of one hard drive.

RAID 1 arrays are primarily used where data security is high and the ability to recover corrupted data is required quickly.

RAID5 is the best solution. RAID Classification & Overview:

RAID is the abbreviation of Redundant Array of Inexpensive Disk, which means cheap redundant disk array, which is the theoretical standard for the technical implementation of disk arrays, and its purpose is to reduce errors and improve the performance and reliability of the storage system. The commonly used levels of RAID are level, etc.

1. RAID 0 is the fastest and most efficient array type, but it does not support fault tolerance.

2. RAID 1 is suitable for arrays with high performance requirements and fault-tolerant functions. In addition, RAID 1 is the only option to support fault tolerance in environments with fewer than 2 disks.

3. RAID 3 is used to enhance data and accelerate data transmission for a single user on continuous long records.

4. RAID 5 is the best choice in multi-user environments with low performance requirements for data writing. However, it requires at least 3 and usually uses 5 disks to perform.

5. RAID 10 combines good reliability and high performance.