OPEN-E DSS V7 Application series Quad build software raid

Continuous OPEN-E DSS V7 Application Series three introduction to Web management

First, RAID technology introduction

RAID (Redundant array of independent Disks): Independent redundant disk array, abbreviated to disk array. RAID is a storage device that is organized in a certain form and scheme. It is better than a single storage device in speed, stability and storage capacity, and has a certain degree of data security capabilities.

There are several common specifications for raid:

RAID 0:raid 0 continuously splits data in bits or bytes, reads/writes on multiple disks in parallel, and therefore has a high data transfer rate, but it has no data redundancy and is not considered a real RAID structure. RAID 0 simply improves performance and does not guarantee the reliability of the data, and one of the disk failures will affect all data. Therefore, RAID 0 cannot be applied to situations where data security requirements are high.

RAID 1: It is data redundancy through disk data mirroring, resulting in mutually backed-up data on paired independent disks. When raw data is busy, data can be read directly from the mirrored copy, so RAID 1 can improve read performance. RAID 1 is the highest unit cost in a disk array, but provides high data security and availability. When a disk fails, the system can automatically switch to read and write on the mirrored disk without having to reorganize the failed data.

RAID 0+1: Also known as the raid 10 standard, is actually the product of the combination of RAID 0 and RAID 1 standards, which is used for redundancy of disk mirroring for each disk while continuously splitting the data in bits or bytes and concurrently reading/writing multiple disks. It has the advantage of having RAID 0 at the same time with the extraordinary speed and RAID 1 data high reliability, but the same CPU usage is also higher, and the disk utilization ratio is low.

RAID 3: It is very similar to Raid 2, where data is striped across different hard disks, except that RAID 3 uses simple parity and holds parity information with a single disk. If a disk fails, the parity disk and other data disks can regenerate the data, and if the parity disk fails, it does not affect data usage. RAID 3 provides a good transfer rate for large amounts of continuous data, but for random data, parity disks can be a bottleneck for write operations.

RAID 5:raid 5 does not specify the parity disks separately, but instead accesses data and parity information across all disks. On RAID 5, the read/write pointer can operate against a list of devices at the same time, providing higher data traffic. RAID 5 is more suitable for small data blocks and random read and write data.

The main difference between RAID 3 and RAID 5 is that RAID 3 involves all array disks for each data transfer, whereas for RAID 5, most data transfers operate on only one disk and can be performed in parallel. In RAID 5 There is a "write loss", that is, each write operation will produce four actual read/write operations, two reads the old data and parity information, two times write new data and parity information.

RAID 6: Raid 6 Adds a second independent parity information block compared to RAID 5. Two independent parity systems use different algorithms, and the data is very reliable, even if two disks fail at the same time without affecting the use of the data. However, RAID 6 requires more disk space allocated to parity information and a greater write loss than RAID 5, so "write performance" is very poor. Poor performance and complex implementations allow RAID 6 to be rarely used in practice.

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Second, OPEN-E DSS V7 support for raid

Currently raid is divided into hardware RAID and software RAID. Hardware RAID requires hardware as support, which requires a RAID card. It is characterized by fast speed, good stability, and can effectively provide high level of hard disk availability and redundancy. Test to the price, the general it enthusiasts to buy and sell the use of RAID is not much. Fortunately, many operating systems such as Microsoft, starting with Windows 2003, provide embedded software RAID capabilities, and soft raid can implement RAID0, RAID1, RAID5. Software RAID is not only very convenient to implement, but also a lot of savings in valuable funds. Of course, the performance and efficiency of software RAID cannot be compared with hardware RAID.

The OPEN-E DSS V7 supports both hardware RAID and software RAID.

Third, the operation process of software RAID in Open-e DSS V7

OPEN-E DSS V7 currently supports software RAID modes of 0, 1, 5, 6.

In order to be familiar with the operation process, the author has added four SCSI hard drives on the DSS01 server to meet the deployment conditions of the above four types of RAID.

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Using the Web to manage DSS servers Https://192.168.0.220

Select "Software RAID" under the "Settings" menu

In the right window, the unit can be re-scanned via rescan.

The window shows the unit that may be used to generate the raid (this can understand the physical hard disk) information

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Tick unit, select RAID level, then select Create.

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If the condition does not meet (the number of blocks on the hard disk), a warning message appears.

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Here, I will be four pieces of hard drive brand new, build RAID5.

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After the wait is complete, display as. The status of each cell displays "in Use,unit MD0".

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Click "MD0" in the left window to display the

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The user can remove the raid from the Remove button at the bottom of the window.

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Three, fault simulation

In order to see the impact of hardware failure (hard disk) on RAID, the author shuts down the DSS host and first snaps "RAID5". Then delete a hard disk, restart the DSS host, and re-manage it in the web.

When a piece of hard disk is damaged:

RAID5 Status display: Clean,degraded, indicating that the raid has failed, but RAID5 can also be used normally, need to replace the faulty hardware in time.

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When two hard drives are damaged:

The status is displayed as: Inactive. RAID corruption.

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When only one hard disk fails, the author re-added a new hard disk after shutdown, restart the system

Click on the settings under the Software RAID menu, you can find the newly added hard drive has been found, the status is available;

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Select the newly added hard drive and select "Spare for MD0" in the Raid level drop-down list and click the Add button to complete the RAID rebuild

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Of course, the user can establish a share on the raid, through the disk failure before and after the access to the specified file to test the security of the raid data protection ability.

This article is from the "Start from the Heart" blog, please be sure to keep this source http://ycrsjxy.blog.51cto.com/618627/1773897

OPEN-E DSS V7 Application series Quad build software raid