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When flash meets RAID: how to protect data security

Article provenance: Editor in chief: Popularity: - Publication time: 2015-02-09 10:31. large in Small ]

The common mainstream mode of RAID

RAID is developed for hard disk drive, but with the emergence of flash memory, then the problem arises. How can we use RAID to work well in flash memory? Is it configured with standard RAID or will it be better in other ways?

Speaking of RAID, it can be said that everywhere in the current world, the technology covers a variety of disk based redundant designs, which can help damaged disks into data recovery, and bad disks can reconstruct information on other disks.

RAID is not a single mode. Different vendors can adopt different RAID modes to implement data protection. There are many RAID ways that can be chosen for you. Let's look at the current mainstream method.

RAID mode:

RAID 0: two or more hard drives can store data in RAID 0 mode, but RAID 0 does not provide redundant protection. It is created to increase data capacity and does not provide protection itself.

The disks in RAID 1:RAID 1 are divided into mirrored disks and stored disks. The biggest advantage is that they can provide data. But because half of the storage hard disk is data mirrored, its capacity is small. RAID 1 must be a disk of two or double digits.

RAID 5: using distributed parity check, not only can we provide data protection, but also increase the storage capacity of data. RAID 5 needs at least 3 disks, while reading performance will be affected. But it is the most balanced way at present. It is the most widely used RAID array at present.

RAID 6 uses dual parity smoke, RAID 6 and RAID 5 have similar data protection methods, but RAID 6 adopts two parity checking methods, although it does not affect reading performance, but it affects writing.

RAID bottlenecks encountered in flash memory

General RAID problem

RAID is not perfect, but there are still some shortcomings. For example, although it provides the function of restoring data, it is possible to encounter data that can not be read in the process of reconstruction. Meanwhile, the RAID reconstruction time may also be too long, which may directly affect the business of the enterprise.

Users need to weigh the capacity and protection level when choosing. RAID 1 is very suitable for data that does not require large capacity and high performance, but requires relatively high data protection requirements. RAID 5 and RAID 5 can provide good capacity and large storage space, but their performance is low.

At the beginning of the traditional RAID, different ways of implementation were set up by the manufacturer to improve the performance or capacity of the RAID group. For example, we need to use redundant RAID levels on a very large scale computing server.

What happens when flash memory stores enter?

With the advent of flash memory, a fundamental change has taken place in RAID. Is this function designed for rotating disk still applicable to flash memory products?

First of all, let's take a look at the difference between flash and hard disk. Flash memory has no moving parts, but there are limitations in reading. Life is an important aspect of it. He can't last forever. Data needs to be protected against flash memory failure.

The single configuration of RAID 1, 5, 6, and 10 may not satisfy the current user needs. It may need a hybrid mode, and RAID10 combines mirroring to protect the security of the entire flash memory. Moreover, the traditional RAID used in flash memory has no special optimization, which has far-reaching impact on the performance of flash memory.

Most flash memory providers have backgrounds from hard disk arrays and start using the standard RAID configuration with their flash systems. And they will also optimize RAID. With the change of storage medium, RAID needs more modes and ways to protect data.

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