Write amplification sand force flash controllers

By Kent Smith on September 24,8: In other words, data cannot be overwritten directly as it is in a hard disk drive. Instead, SSDs use a process called garbage collection GC to reclaim the space taken by previously stored data. This is bad because the flash memory in the SSD supports only a limited number of writes before it can no longer be read.

Write amplification sand force flash controllers

LSI purchased SandForce some time ago and is using the acquired company to push into areas it previously had not played. The new SF series controllers allow for faster, higher capacity storage than previous generations. Many of these features have been found in previous generations SandForce controllers and are due to their proprietary compression algorithms.

One of the biggest improvements in this generation is the new SandForce DuraWrite endurance technology. As we have seen with the recent Avoton productslow power is king. It protects the drive after an error occurs, so in a way it is similar to RAID protection, but on a single drive.

RAISE protects against page, block and full die failures in a single drive environment. They are also smaller, more power efficient, and cheaper to boot.


Conclusion So what does this mean for businesses and consumers? It means faster SSD drives, with higher capacity. It also means cheaper SSD drives, which is something people have been asking about for a while. The biggest barrier that Solid State Drives have faced over the last five years is that they have been extremely expensive, and extremely low on capacity.

The cost per gigabyte was astronomical and is still much higher than that of mechanical hard drives.

Now, at a queue depth of one, an SSD with a non-SandForce controller in it always incurs write amplification greater than or equal to one, meaning flash cells wear faster than on a SandForce-based drive. By compressing data, the SSD and its contemporaries are able to write less data and extend overall endurance. The LSI SandForce SF Flash Controllers bring huge benefits for drive manufacturers. In addition to being the first PCIe Gen2 flash controller, it also brings SATA 6Gb/s functionality in one design. This . This compression leads to other desirable features. It reduces the "write amplification" effect of SSDs and increases their "durability". SSDs degrade over time as data is repeatedly modified, and the SandForce compression reduces this effect. But there is a tradeoff. For incompressible data, the SandForce controllers perform the slowest.

Both NANDFlash and Controllers like the SandForce are much cheaper than they used to be, which makes it easier for manufactures to pass those savings on to business and consumers. What all this means is that SSDs will become more and more prevalent in datacenters in the next few years.

This will allow for faster performance, and smaller servers.

write amplification sand force flash controllers

Talk back in the comment section below or in the forums.If the average number of writes to flash were twice the number of host system write requests then the Write Amplification would be If you were to write a piece of system software that measured SSD writes, this measurement would fall short of the actual number of times the flash chips were being written to because of Write Amplification.

SandForce was an American fabless semiconductor company based in Milpitas, California, that designed and manufactured flash memory controllers for solid-state drives (SSDs). On January 4, , SandForce was acquired by LSI Corporation and became the Flash Components Division of ashio-midori.comarters: Milpitas, California, U.S.

On Monday, the LSI Corporation introduced its third-generation SandForce flash controller line, the SF, promising increased levels of flash performance, reliability, endurance, and the flexibility to support both native PCIe Gen2 x4 and SATA 3 (6 Gb/s) host interfaces in a single ASIC design.

write amplification sand force flash controllers

The company claims a write amplification factor of for the controller, which means that a 1GB host write typically translates to only MB worth of flash writes.

SF flash controllers deliver exceptional, consistent performance in real-world with high entropy data. The SF family is optimized for low-power environments Enhanced DuraWrite™ data reduction lowers write amplification and P/E cycles to maximize SSD endurance. Where SandForce spends a lot of silicon on compression and deduplication in order to minimize write amplification and extend the life of its NAND flash chips, the Link_A_Media controller relies on.

Sandforce write amplification and free space | [H]ard|Forum