How does RAID work? How does raid5 work?

1: First of all, you must be clear about what you want to achieve by doing RAID. Then find out which array to use.

2: What kind of hard disk is you, what array does the motherboard support, or what array does the array card support, what chip is it?

3: Different array chip practices are different, but there will be specific prompts, in fact, it is very simple.

General steps: 1: Enter the BIOS and turn off the display of the logo. Find Disk Management and change the hard disk mode to array mode.

2: Save and restart, and follow the prompt button to enter the array interface.

3: Create an array. You can do whatever array you want.

Save, exit.

Created in the BIOS of the RAID card. Or install the RAID card driver under the operating system and create it in the GUI management interface of the RAID card.

Plug in the hard disk, boot up and press the hotkey to enter the RAID control interface (there is a prompt when booting up, generally Ctrl+A, Ctrl+H, Ctrl+I, etc.). In the configuration interface, make the 3 hard disks into RAID 5, purely imitate the division of logical drives (logical drives are hard disks in the eyes of the operating system), restart the machine, and install the operating system (you may need to set the boot device in the BIOS first).

A few tips: 1. When your 3 hard disks are doing RAID, the data on them will be emptied;

If the block hard disk is RAID 5, the final capacity is the capacity of the smallest disk*2;

3. Most motherboards cannot use IDE hard disk group RAID;

4. If it is an Intel motherboard, you can consider using Intel Matrix RAID technology to build RAID, which is more flexible;

5. You can also consider using soft RAID (Windows and Linux have corresponding functions), and the way is also very flexible;

6. If the motherboard does not have an integrated RAID controller, you can purchase a RAID card to build RAID;

7. In the process of using RAID, once the RAID array alarms, the best solution is to buy a new hard disk immediately to replace the alarm hard disk, rather than to know and ask questions, remember to remember!!

8. Please read the technical manual of your RAID controller carefully (if the SCAR is integrated RAID, it should be in the motherboard manual);

9. Are you sure you really need to use Rarid?

In addition, give a detailed reference:

RAID 5 is a storage solution that balances storage performance, data security, and storage costs. RAID 5 can be understood as a compromise between RAID 0 and RAID 1. RAID 5 can provide data security for the fiber system, but the degree of protection is lower than that of Mirror, and the disk space utilization is higher than that of Mirror.

RAID 5 has similar data read speeds as RAID 0, but with the addition of parity, and writing data is slightly slower than writing to a single disk. At the same time, because multiple data correspond to one parity information, RAID 5 has a higher disk space utilization rate than RAID 1, and the storage cost is relatively low, which is a widely used solution.

The main differences are as follows:

1. Data security is different. The security of this hard drive mode is very high, and the data security of RAID 1 is the best of all RAID levels. However, the disk utilization rate is only 50%, which is the lowest of all RAID levels.

2. The concept is different. Conceptually, RAID 2 is similar to RAID 3 in that both strips data is distributed across different hard disks, with blocks in bits or bytes.

3. The verification information is in different ways. Use a single disk to store parity information. If a disk fails, the parity disk and other data disks can regenerate the data.

If the odd and even disk fails, the data usage will not be affected. RAID 3 provides good transfer rates for large amounts of sequential data, but for random data, the odd-even disk can become a bottleneck for writes.

4. Different ways of data access. RAID 4 is very similar to RAID 3, the difference is that its access to data is carried out by number of key blocks, that is, by disk, each time is a disk. As you can see from the diagram, RAID3 is one bar at a time, while RAID4 is one bar at a time.

Its characteristics are similar to RAID3, but it is much more difficult than RAID3 when it fails to recover, the controller design is much more difficult, and the efficiency of accessing data is not very good.

5. The readout efficiency is different. As you can see from its schematic, its parity code is present on all disks, where p0 represents the RAID 5 parity value in zone 0, and the other meanings are the same. 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 and a single disk is allowed to fail. RAID 5 also uses the check digit of the data to ensure the security of the data, but it does not store the check digits of the data on a separate hard disk, but stores the check digits of the data segments on each hard disk.