LSI SandForce 5 Series SSD Firmware - TRIM Performance Investigated

LSI SandForce 5 Series SSD Firmware - TRIM Performance Investigated

Five months ago we published a review of the SanDisk Extreme 240GB SSD. This drive, the first of its kind in more ways than we knew at the time, started a long and frustrating experience. The Extreme was the first product to cross our desk with new SanDisk 24nm Toggle Mode Flash. At that time, it was easy to point to the flash and say that any problem discovered had to do with the new exotic flash. What we didn't know at the time was the Extreme also brought with it our first look at Series 5 firmware from LSI SandForce.

 

The firmware system in place works roughly like this. The base code is produced by SandForce and that is where the revision number comes from. Before February 28th, drives coming in used what we call Series 3 (3.3.2, 3.3.4 and so on). The base code goes to manufacturers where it is key coded and customizations are added. In the customizations, features that produce Max IOPS, CapX 'Host Power Loss Protection' capability, throttle rate and other differentiating points are added. At that point the manufacturers release the code to the public. If there is a problem with the underlying base code, it affects everyone who builds on top of it. We see the same thing with motherboards, video cards and other products as well - if Intel's foundation code is off, then the problem is found on all motherboards using that underlying code.

 

In our testing the SanDisk Extreme 240GB was very fast, faster than any other SandForce based drive we've ever seen before"¦ at first. The problem started to show up as we worked our way through the benchmarks. After a standard run we went back and re-tested the drive without a secure erase cycle and the performance dropped like a brick. These were the very same tests we'd just run a couple of hours before and achieved record setting scores. For the next month we worked our way through all of the typical issues that could pop up. System stability, drivers and so forth were all tested out of the equation. By that time I had six test systems running in the lab 24/7 and a whole fleet of SanDisk Extreme drives.

 

 

LSI SandForce 5 Series SSD Firmware TRIM Lost and Found Performance Investigated


Link: TweakTown

Skrevet af Martin den 1. Aug 2012. Nyheden er læst 384 gang(e).

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