RAID level, RAID function what is a RAID level? _ Server Other

Source: Internet
Author: User

Question: What is a RAID level? What does the raid level mean?

RAID technology is divided into several different levels, offering different speeds, security, and price/performance. Choose the appropriate RAID level to meet the user's requirements for storage system availability, performance, and capacity, depending on the situation. Common RAID levels include the following: Nraid,jbod,raid0,raid1,raid0 1,RAID3,RAID5. Currently, RAID5 and RAID (0 1) are frequently used.


Nraid is Non-raid, the capacity of all disks is grouped into a single logical disk, with no data block bars (no blocks stripping). Nraid does not provide data redundancy. Requires at least one disk.


JBOD represents just a Bunch of drives, the disk controller regards each physical disk as a separate disk, so each disk is a separate logical disk. JBOD also does not provide data redundancy. Requires at least one disk.


RAID 0 is the data stripping (striped technology). The entire logical disk's data is distributed across multiple physical disks, and can be read/written in parallel, providing the fastest speed, but without redundancy. Requires at least two disks. With raid 0, we can get a larger capacity of a single logical disk, and gain higher access speed by simultaneously reading multiple disks. RAID 0 first considers the speed and capacity of the disk, ignoring security, as long as one of the disks is out of the question, the entire array of data will not be insured.


RAID 1, also known as the mirroring method, is the redundancy of the data. During the entire mirroring process, only half of the disk capacity is valid (the other half of the disk capacity is used to hold the same data). Compared with raid 0, RAID 1 considers security first, with half capacity and speed unchanged.

RAID 0 1

To achieve high speed and security, RAID 10 (or RAID 0 1) is available, and RAID 10 can be simply understood as a RAID 0 array of multiple disks for mirroring.

RAID 3 and RAID 5

Both RAID 3 and RAID 5 are checksums. RAID 3 works by using a disk to store the checksum data. Because any change in data to modify the corresponding data verification information, the disk that holds the data has several and parallel work, while the disk that holds the checksum data is only one, which brings the bottleneck of verifying data storage. RAID 5 works by slicing the data from each disk into chunks and storing them in each disk that makes up the array, thus easing the bottleneck when validating data is stored, but dividing the data and controlling the storage costs at a speed.

Depending on the hard disk interface, RAID is divided into SCSI raid,ide raid and SATA raid. SCSI RAID is primarily used for servers/workstations that require high performance and reliability, while the main desktop uses IDE RAID and SATA raid.

Previous RAID functionality relies on the docking of RAID control cards on the motherboard, and more and more motherboards are now added to the onboard RAID chip to directly implement

Question: What is a RAID level? What does the raid level mean?
Now RAID features, the current mainstream raid chip has Highpoint HTP372 and promise pdc20265r, and Intel further, directly in the motherboard chipset support RAID, its ich5r South Bridge chip in the built-in SATA RAID features, This also represents the future direction of onboard RAID---chipset integrated raid.

Matrix RAID:

Matrix raid, which is known as "matrices Raid", is a low-cost disk redundancy technology supported by the ICH6R Bridge, and is a novel and cost-effective raid solution. Matrix RAID technology is fairly simple, requiring only two hard drives to achieve a RAID 0 and RAID 1 disk array, and does not require additional RAID controllers, which is what our average user expects. Matrix RAID requires both the hardware layer and the software layer to support it, and the hardware is currently the ICH6R Bridge and the higher-order ICH6RW Bridge, while Intel application Acclerator software and Windows operating systems support the software layer.

The rationale for Matrix raid is to divide each hard disk's capacity into two parts (i.e.: virtual one hard disk into two hard disks, with a total of 4 children, with two virtual hard disks to create the RAID0 mode to improve performance, while the other two virtual child drives are comprised of raid via mirrored backups 1 is used to back up data. In Matrix RAID mode, the data storage mode is as follows: The first part of two disk drives is used to create a RAID 0 array, primarily to store the operating system, applications, and swap files because the disk starts with a higher access speed, and Matrix raid 0 The main cause of the logical partition is placed on the front end of the hard disk (outer ring), which is the best performance for the module that needs the performance, while the second part of the two disk drives is used to create the RAID1 mode, which is used primarily to store the user's personal files and data.

For example, using a two 120GB hard drive, you can make the former 60GB of two hard drives a 120GB logical partition, and then leave two 60GB blocks to form a 60GB data backup partition. You can install in a RAID 0 partition and require security-ready data to be installed in a RAID 1 partition if you want an application that is efficient and does not require security. In other words, the total hard disk space that the user obtains is 180GB, compared with the traditional RAID 0 1, the benefit of capacity usage is very high, and has the flexibility of the capacity configuration. In the event of a hard disk damage, the RAID 0 partition data is naturally not recovered, but the RAID 1 partition data is saved.

It can be said that with the Matrix RAID technology, we need only 2 hard drives to gain efficient data access while ensuring data security. This means that ordinary users can also enjoy a RAID 0 1 application Mode at low cost.


NV RAID is a RAID technology developed by NVIDIA, with NF

Question: What is a RAID level? What does the raid level mean?
Orce series of Chip group development has also been new. In contrast to other RAID technologies, the current NFORCE4 series Chipset's NV RAID has its own distinctive features, mainly the following:

(1) Staggered raid (Cross-controller RAID): Interlaced raid, commonly known as hybrid raid, that combines the hard disk of the SATA interface with the hard drive of the IDE interface to form a RAID mode. Interlaced raid has been seen in the NFORCE3 250 series chipset and has been extended and enhanced on the NForce 4 series chipsets.

(2) Thermal redundancy backup function: In the nforce 4 series chipset, the user can replace the damaged hard disk in the course of use and rebuild a new mirror in the running state to ensure the security of important data because of the serial ATA 2.0 's hot plug function. Even more gratifying, NForce 4 's Nvidia RAID controller also allows users to add a redundant backup feature to a running RAID system, regardless of which RAID mode the system takes, and the user can provide "administrative tools" in the driver Any extra hard drive is assigned as a hot backup of the raid system. This hot redundant hard drive can be shared by multiple RAID systems (such as a RAID 0 and a RAID1), or it can be owned by one of the raid systems, similar to the current high-end raid system.

(3) Easy RAID Mode migration: The NV RAID module of the NForce 4 series chipset has a new feature called "morphing", which requires the user to select a converted RAID mode and then perform a "morphing" operation. RAID deletion and mode reset work can be done automatically, without human intervention, ease of use is significantly improved.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.