About the choice of hard disk raid0 and solid state

The performance of two 500G SATA3 interface hard disk groups RAID0 is not as good as that of SSDs, and the slightly better array cards cost more than 1,000 yuan.

I am currently using an ADATA SX900 128G SSD, which can test the read and write speeds of 535MB s and 511MB s with ATTO, and 502MB s and 197MB s with AS-SSD. In addition, the SX900 comes with a software called Acronis Ture Image HD, which can be activated with the serial number on the SX900 and ready to use. This software is very convenient.,It's equivalent to ghosting the system disk in the windows system.,You can use it directly after completing the copy.。

RAID0 will not make you boot up much faster, because the boot speed depends on the seek time and access speed, and the more hard disks, the slower these two parameters are.

The seek and access of the SSD are more than 50 times that of the mechanical, so the boot is fast.

The game has a fast reading speed, so you have to throw the game into the SSD.

After writing data, it slows down significantly because it is full, and it is not recommended to write full, generally about 80% will not reduce the speed.

The current motherboards all have a disk array function, you can go to the BIOS to adjust it;

The SSD can only install the system, but the boot system is faster, but your things are still in the mechanical hard disk, and the reading and writing are not much faster, except for using the Z68, Z77 chipset.

It is very simple to need H77 or Z77 or above motherboard support, 1, physical installation, SSD plug native SATA3 interface, mechanical hard disk random interface 2, normal installation of win7 to SSD, directly use win7 to divide the SSD into a region in place (automatic 4K alignment), drive wizard installation of various drivers, disk management of mechanical hard disk partitioning and other operations.

3. Reboot into the BIOS, set the SATA mode to RAID, and change the Intel SRT from Disable to Enable.

4. Enter the RST program in the system installation CD.

5. Restart the computer, open the main RST interface, and a "Accelerate" button will appear at this time! Click to start acceleration, select the cache capacity in the pop-up window, select the maximum 64G, and do the cache for the mechanical hard disk.

6. Restart again, all completed.

Not only is the system the fastest on the native SSD, and then the speed on the HDD is completed.

You need a chipset like Z68 H77 Z77 to enable this technology (called intelligent response technology).

1.First of all, go to the BIOS of the computer and turn on the RAID mode of the disk interface, which generally has IDE AHCI and RAID mode;

2.If the blue screen is on, you need to go back to BIOS to change back to the previous settings, then enter Win8, change the disk controller to RAID driver, and then change back to RAID mode to enter Win8

If you don't have a blue screen, just install the Intel RST driver.

3.Find the SSD in the Intel RST control panel, then click Accelerate, and then follow the prompts to distribute, the maximum can only use 64G to accelerate the HDD.

It's only on servers that you need such complex technology.

It can be achieved with LSI9260-8i RAID card + Cachecade Key.

After using this technology, SSD RAID and HD RAID are configured separately, and SSD RAID (RAID 1) will be used as a cache, and the system will automatically put hot data into SSD RAID. In this way, it is equivalent to your machine has hundreds of gigabytes of memory, and most applications are operated in memory for you, and the speed is naturally very cool.

If it is a personal computer, at most use the SSD as the operating system disk, and then use the remaining HD to form the RAID level you want for data storage.

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August 2019 update: The performance difference caused by the capacity of the SSD is basically 128GB-256GB-512GB, and the performance is doubled with each capacity increase. According to the comparison of the same interface and protocol, such as the same SATA interface, the same PCIe interface, etc., different excuses and different protocols (SATA, NVME) do not have comparative reference value.

Reply at the end of 2017: The speed of 120GB and 250GB of SSDs of different brands varies greatly, and basically the speed above 250 is not so different. Most of the disk 64 is half the speed of 120GB.

But not 120GB is half the speed of 250GB, it's just a partial, and most 250GB is basically the same speed as 500GB. There won't be a big difference. (The above comparisons are all in the same series of products of the same brand, and the comparison with the main control).

This data can be seen in the SSD section of major computers.

The landlord can go to the following ** to view, there is a certain reference. 256GB of read and write is basically up to a lot of 500GB speeds, and even 64GB of read speeds are about the same as 256 speeds. The only difference is in the speed of writing.

Therefore, it is recommended that the landlord still find the SSD of the model he wants to buy to understand its read and write speed separately, so that it can be comparable.

After group raid0, there is no trim, and the impact on performance is not so great. The latest driver for Intel chipset motherboards already supports riad0's trim function. In many tests, there is no TRIM or even much difference in speed, and occasionally a software test has a maximum difference of 20%, and most of them are not very different.

Originally, the speed of the SSD is already relatively good, and you basically don't notice the loss of speed.

In addition, TRIM only affects the performance of the SSD, and basically has little impact on the lifespan. Wear leveling is the feature that has a fatal effect on the SSD, and RAID does not affect this function.

RAID0 is basically a doubling of speed, and the landlord understands the difference between his disk capacity and speed by accurately evaluating the data according to the actual SSD model, and objectively considers using that combination.

After the RAID is grouped, the read and write speeds will be doubled, and other performance will not change much. However, after the RAID is assembled, it will lose the TRIM function, which is a hard flaw of the SSD and will shorten the lifespan. So don't group raid unless you don't care about the money.

Brand, the type of flash memory chip, the main control, is the main factor affecting the speed of the SSD, generally the capacity is fast, but the capacity is too large will cause high latency, generally choose a single disk of 250G, it is best not to choose the SSD of the SF main control

Although the continuous read and write speed of SSD group RAID0 looks good, it is not recommended to do so for the following reasons.

The biggest advantage of SSD is 4K performance, which is completely incomparable with mechanical hard disks, so the performance of SSD as a system disk is much higher than that of mechanical hard disks (except for a few garbage main control SSDs), and group RAID 0 not only does not help 4K, but will drag down 4K performance.

At present, the life of the SSD is basically based on the life of the MLC particles, and the number of copies of the MLC is limited, and the number of copies reaches a certain number of times and it hangs.

Under normal circumstances, SSDs have wear leveling, so that the number of rewrites of all particles is basically the same, and finally when one particle hangs up, the use value of other particles is basically squeezed out, and other particles that have not been used are wasted because of the high loss rate of one particle.

However, the loss balance is only for one SSD, and the loss of the two SSDs after RAID0 is usually inconsistent, and RAID0 will lose all the data as long as a hard disk is attached, so there will be a greater risk of loss of data on the SSD when using it this way.

At present, the array card basically does not support TRIM, which means that TRIM is invalid after forming an array, and without the support of TRIM, the effect of GC (garbage**) will be greatly reduced, resulting in obvious performance degradation after long-term use. The existence of TRIM can be ignored by the SSD with SF master, but the SSD with SF master control is a single-card** SSD

At present, a large number of low-end SSDs use low-performance master control, and there are many master control algorithms that are very stupid and naïve, such as TOSHIBA T6UG1XBG SSD master controller, which will actually make a move to write after the cache is full, this algorithm can only be said to be 2 to a certain level, and these problems are not RAID can solve.

And the write amplification factor of the low-end SSD is very high, Intel nominal less, SF nominal average is, and JMF602's write amplification factor is greater than 5, that is to say, writing the same data, JMF602 consumes 5 times the number of rewrites consumed by Intel, 10 times that of SF, which means that JMF602 dies at 5 times the speed of Intel and 10 times that of SF.

Instead of using a cheap SSD group RAID0, it is better to buy an Intel SSD or use an SF SSD as a system disk and a mechanical hard disk as a data disk.

The performance is superb!! It's better to buy Corsair and Intel, never OCZ

When the system disk is solid-state, the storage is RAID used

The solid state is fast, and the addressing time is already faster than that of HDD, even if it is RAID, it is not as fast as SSD.