What is the purpose of the hard disk RAID0 1 5 and so on, how the hardware and software are assemble

1. RAID 0 is to merge multiple (at least 2) hard disks into one logical disk, and the data is read and written to each hard disk at the same time, and different hard disks write different data, which is fast.

2. RAID1 is to read and write to 2 hard disks (the same data) at the same time. Emphasize the security of your data. Relatively wasteful.

3. RAID5 also combines multiple (at least 3) hard disks into one logical disk, and parity information will be established when data is read and written, and the parity information and corresponding data are stored on different disks. When a disk of RAID 5 is corrupted, the remaining data and the corresponding parity information are used to recover the corrupted data. Equivalent to a combination of RAID0 and RAID1.

4. RAID10 is RAID1+RAID0, with high speed requirements, complete fault tolerance, and of course, many times the money is also the most.

RAID was proposed by a professor at the University of California, Berkeley, in 1988. RAID is an abbreviation for Redundent Array of Inexpensive Disks, which literally translates to Cheap Redundent Disk Array, also known simply as Disk Array.

RAID is a redundant disk array, referred to as a disk array, and the specific differences are as follows:

raid 0：

A minimum of two disks is required; striped data distribution; No redundancy, best performance (no storage of image and verification information); It cannot be used in situations where data security is required.

raid 1：

A minimum of two disks is required; Provide block redundancy; Good performance.

raid 5：

A minimum of three disks is required; distribution of data stripes; redundancy with parity; It is suitable for scenarios where more reads and fewer writes are used, and is the best compromise between performance and data redundancy. 、

RAID 10 (also known as RAID 1+0):

A minimum of four disks is required; First, divide the two groups into two groups by RAID 0, and then image the two groups in RAID 1 mode. Balance redundancy (providing mirrored storage) and performance (striped data distribution); It is commonly used in practical applications.

1. Definitions.

RAID1 is used to improve the high availability of hard disks, and RAID0 is used to increase high concurrency.

2. Differences. Similarities: both require at least two hard drives;

Differences: 1. Disk utilization, RAID0 disk utilization is 100%; The RAID1 disk usage is 50%.

2. In the usage scenario, RAID0 because the data is stored separately in each hard disk that makes up the array, once one of the hard disks has a problem, all the data will be damaged.

The principle of RAID1 is an array composed of two hard disks, one of which is used normally, and the other is specially backed up and stored, which means that you can only use one hard disk for two hard disks, and the other is to save the data in this hard disk, so that even if you have a hard disk that is broken, the data will not be lost.

3. Precautions.

1. The disadvantage of RAID 0 is that it does not provide data redundancy, so once the user's data is corrupted, the corrupted data cannot be recovered. When RAID0 is running, any failure with any one of the hard disks will result in the failure of the entire data. In general, it is not recommended for enterprise users to use it alone.

2. RAID 0 has characteristics that make it especially suitable for fields with high performance requirements and little concern for data security, such as graphics workstations. For individual users, RAID 0 is also an excellent choice to improve the storage performance of hard drives.

3. RAID 1 is the highest unit cost in the hard disk, but provides high data security and availability, when a hard disk fails, the system can automatically switch to the mirror hard disk to read and write, and does not need to reassemble the failed data.

RAID0 is the highest storage performance in the RAID level, with 100% disk utilization; Because the data is stored separately in each of the hard drives that make up the array, a problem with one of the drives can lead to corruption of all the data.

RAID1 ensures the availability and repairability of user data to the greatest extent, with a disk utilization rate of 50%; Because the principle of RAID 1 is an array composed of two hard disks, one of which is used normally, and the other is specially backed up and stored, which is equivalent to your two hard disks can only use one hard disk, and the other is to save the data in this hard disk, so that even if you have a hard disk broken, the data will not be lost, and the two hard disks can only use the capacity of one hard disk, and now all the servers in the Bumblebee server use RAID 1

1. In terms of the number of hard disks, RAID 0 must have at least 2 hard disks. RAID 1 has at least 2 hard disks and an even number of hard disks. RAID 5 with at least 3 hard drives.

2. In terms of capacity, the capacity of RAID 0 is the sum of the capacity of all hard disks. RAID 1 is half of the total capacity of all hard disks, and RAID 5 is the sum of all hard disks minus the capacity of one hard disk.

RAID 0 is the use of all hard disks as one logical storage space. RAID 1 dedicates half of the hard disk space to store data mirroring to ensure the integrity and reliability of data. RAID 5 uses a hard disk to verify data storage to ensure the integrity of data storage.

The things you see in the hard disk space are getting deeper and deeper, and the difference between them is actually not too big, and there is still no obstacle in real-world applications.

A single hard disk cannot achieve RAID0, and the hardware conditions required to build RAID0 are:

At least two hard drives – preferably the same model.

Have a RAID card or a motherboard that supports RAID capabilities.

The Chinese name of RAID is called disk array, which is a technology that uses multiple cheaper disks to combine into a disk group with a huge capacity, and uses individual disks to provide data to produce a bonus effect to improve the performance of the whole disk. RAID can be divided into many types, but we commonly use only RAID0, RAID1, RAID0+1 and RAID5, the characteristics of these types I briefly describe as follows:

RAID0, a minimum of 2 hard disks is required to assemble. The biggest advantage is that it is fast, but the security is poor, if one hard disk in the array is damaged, it will lead to the loss of all data, which is suitable for the occasion where speed is pursued but the security requirements are not high.

RAID 1, a minimum of 2 hard disks is required to assemble. Its outstanding feature is excellent security, but the disadvantage is that the disk utilization rate is low, and the speed is almost not improved compared with a single hard disk, which is suitable for occasions with high requirements for data security.

RAID 0+1, a minimum of 4 hard disks is required to build. Its advantage is that it is fast and safe, and the disadvantage is that it requires more hard disks to build RAID 0+1, and the cost is higher, and it is suitable for occasions with high requirements for performance and security and insensitive to **.

RAID 5, a minimum of 3 hard disks is required to assemble. In fact, it is a compromise solution, its performance and security are between RAID0 and RAID1, and the investment cost is lower than RAID0+1, which is widely used in reality.

Door-to-door recovery data for fan service, raid0 server hard disk is broken, the system is paralyzed, see if you can successfully recover the data.

Taking off your pants and farting --- a lot of things.

RAID 0 A hard drive doesn't make sense, even if it does.

If you have to do it, just do it in the array card settings.

Boss bluff you, soft raid doesn't work, even if it does, it's pointless, where do the resources for performance improvement come from??! A hard drive, hard raid is not possible. raid0 at least 2 blocks...

Blocks are OK, just p45....p55...This kind of civilian motherboard, 4 mechanical hard disk RAID0 is about the same, 2 SSD RAID0 is about the same, and the performance improvement is limited, after all, the RAID control chip can't reach that level!!

In the case of RAID1, the hard disks should be paired. raid0+1 should also be paired. RAID5 at least 3 blocks....

Blocks are OK. Personally, I think that it is enough to use RAID0 to improve the performance of the system disk and program running disk at home, and there is no need to use RAID1 to backup, it is better to make a double copy of important information. RAID 0+1 is generally used for application services such as ERP, RAID 5 is generally used for file services, and there are also application services, which are not practical for home users, and are completely motor and electricity-consuming!!

The RAID levels of disks are NRAID, JBOD, RAID 0, RAID 1, RAID 0+1, RAID 3, and RAID 5. The differences between them are roughly as follows: RAID0 has the fastest access speeds, but there is no fault tolerance.

RAID 1 is fully fault-tolerant but relatively costly, with a disk utilization of 50%. Raid3 writes have the best performance, but no multitasking capabilities. RAID 5 is multitasking and fault-tolerant, with 0+1 fast and fully fault-tolerant when writing, but at a high cost.

Redundant arrays of independent disks (RAID) means "redundant arrays with redundancy capabilities composed of independent disks".

The disk array is composed of many cheaper disks combined into a huge capacity disk group, and the additional effect generated by the data provided by individual disks improves the performance of the entire disk system. Using this technology, the data is sliced into many segments and stored on separate hard drives.

Disk arrays can also use the concept of parity check, which can still read data in the event of a failure of any hard disk in the array, and when the data is reconstructed, the data will be calculated and re-placed into a new hard drive.

The article published by the University of California-Berkeley in 1988: "A case for redundant arrays of inexpensive disks". In the article, the term RAID is talked about, and the 5 levels of RAID are defined.

The purpose of the study at the University of Berkeley was to reflect the rapid performance of CPUs at the time, which grew by about 30 to 50% per year, while hard magnetic machines could only grow by about 7%. The research team hopes to find a new technology that can immediately improve the performance of computers to balance the computing power in the short term. At the time, Berkeley's research focused on efficiency versus cost.

RAID 1 is known as mirroring.

RAID 2 is known as a bandzone.

RAID 4 with parity does not provide redundancy.

RAID 5 is one of the most commonly used.

Linear RAID is used to virtualize a large device.