The SSD Relapse: Understanding and Choosing the Best SSD
by Anand Lal Shimpi on August 30, 2009 12:00 AM EST- Posted in
- Storage
Tying it All Together: SSD Performance Degradation
More spare area is better for random workloads, but desktop workloads aren’t random enough to justify setting aside more spare area to improve performance; most reviews don’t test in a used state, and more users would simply flock to lower price-per-GB drives with less spare area.
Drives that drop the most in performance from new to used state have the most to gain from the TRIM instruction. Depending on how you use your drive of course:
| % Performance Drop in Used State vs. New State | |||
| 4KB Random Write | 2MB Sequential Write | PCMark Vantage HDD Suite | |
| Intel X25-E 64GB (SLC) | 26.1% | 5.4% | 9.7% |
| Intel X25-M G1 160GB (MLC) | 35.5% | 3.8% | 16.7% |
| Intel X25-M G2 160GB (MLC) | 0.7% | 2.2% | 15.3% |
| OCZ Agility 128GB (Indilinx MLC) | 44.8% | 15.0% | 4.4% |
| OCZ Summit 256GB (Samsung MLC) | 72.4% | 3.0% | 23.6% |
| OCZ Vertex EX 128GB (Indilinx SLC) | 60.5% | 20.8% | 0.8% |
| OCZ Vertex Turbo 128GB (Indilinx MLC) | 44.0% | 15.4% | 4.5% |
| Patriot Torqx 128GB (Indilinx MLC) | 44.6% | 15.6% | 3.5% |
Depending on the scenario, all three controllers have a lot to gain from TRIM. Random write performance drops significantly for almost every single drive. The worst is the Samsung RBB controller, which lost over 70% of its performance between new and used states; Samsung needs TRIM.
Intel made some significant improvements going from the G1 to G2 drives, the new drive loses no performance in our random write test. This is thanks to firmware tweaks and having twice as much DRAM to track data in; the more data the Intel drive can keep track of, the better it is at organization, management and garbage collection. From a pure performance standpoint, the G2 might actually be better for server workloads than the X25-E. In terms of lifespan however, the X25-E has the G2 beat.
Only the Indilinx drives lose an appreciable amount of performance in the sequential write test, but they are the only drives to not lose any performance in the more real-world PCMark Vantage HDD suite. Although not displayed here, the overall PCMark Vantage score takes an even smaller hit on Indilinx drives. This could mean that in the real world, Indilinx drives stand to gain the least from TRIM support. This is possibly due to Indilinx using a largely static LBA mapping scheme; the only spare area is then the 6.25% outside of user space regardless of how used the drive is.
Both Samsung and Intel have a lot to gain from TRIM. Samsung’s performances goes from utterly unacceptable to reasonable (but not price justified) with TRIM. Intel’s performance goes from class-leading to more, er, class-leading.
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jtleon - Tuesday, September 8, 2009 - link
Yes I fell asleep atleast 3 times reading this article (it IS Monday afterall)Yes, Indilinx clearly rocks the SSD world - Now I know thanks to Anand!
Stories like this set the standard for all review sites - I don't come away with the feeling I was just sold a bill of goods by some schiester in Intel's pocket, or otherwise.
Great Job Anand! Keep them coming!
SSDdaydreamer - Tuesday, September 8, 2009 - link
I too am wondering whether TRIM will be available on the Intel Drives for Windows XP or Vista. I seriously doubt it, as the OCZ Wiper Tool appears to only be available for Indilinx controllers. Perhaps Intel will introduce their own wiper utility. I am leaning towards the OCZ Vertex or Patriot Torqx drives, as I am quite content with Windows XP and Windows Vista.I have an itchy trigger finger on these SSDs, but I want to hold back for the following unknowns.
1. I would like to use the NTFS file system for my drive, but I am unsure of the proper/ideal block size.
2. I would merely like to image my existing Windows Installation, but I am worried that performance or stability problems will arise from the NTFS file system. A fresh install could be in order, but it is preferred to image.
3. Is there a way to change the size of the spare area? Maybe I have the wrong idea (perhaps only format part of the drive, unformatted space goes appends to the spare area?) I am willing to sacrifice some of the usable partition space for an increased spare area for improved performance.
4. Are there complications with multiple partitions? If there are multiple partitions on the drive (for multi-boot) do they all share the same spare area? Is it possible to allow their own respective spare areas?
Is there anybody out there that could enlighten me? I'm sure others would do well to have the answers as well. If I make any discoveries, I will be sure to post them.
Thanks in advance.
bradhs - Monday, September 7, 2009 - link
IS there a "Wiper" app for Intel X-25m G2 drives? For people who don't have Windows 7 (TRIM) and want to keep the Intel X-25m G2 running smooth.smjohns - Tuesday, September 8, 2009 - link
No there is no wiper tool for Intel drives at the mo. In addition to this the current firmware on the Intel drives do not have TRIM enabled. I guess this will be released soon after Windows7 is released. I think I have read somewhere that Intel are working on a TRIM version of it's Matrix Storage Manager software that will provide this functionality to the other operating systems.Burny - Monday, September 7, 2009 - link
As many before me: great article! I learned a lot about SSD's. Even up to the point i'm ready to buy one.I still have 2 questions tough:
2. Will TRIM be available on the G2 Intel drives for sure? Some sources doubt this: http://www.microsoft.com/communities/newsgroups/en...">http://www.microsoft.com/communities/ne...t=&l...
3. As I understand, TRIM will work on a firmware level. That implies that TRIM will also function under Windows XP or any OS for that matter? Then why the need to build another TRIM into Windows 7? Or does a TRIM firmware enabled SSD simply allows the OS to use TRIM?
Thanks!
smegforbrain - Monday, September 7, 2009 - link
While I consider myself handy with computers, I'm not the best technical mind when it comes to the details. You do an excellent job of presenting everything in a manner that it can be understood with little difficulty. I look forward to future articles about SSDs.I do have a question I'm hoping somebody can answer. I'm as interested in the long-term storage outlook of SSD drives as I am every day use. I've seen it said that an SSD drive should hold its charge for 10 years if not used, and it was discussed a bit earlier in this thread.
Yet, none of my current mechanical hard drives are more than 3 years old; none of my burned DVDs/CDs are older than 5 years. It seems far more likely that I would replace an SSD for one with a greater storage capacity after 5 years tops than to expect one to be in use, even as archival storage, for as long as 10 years.
So, is the 10 year 'lifespan' even going to be an issue with archival storage for most people?
Will this worry over the life span of an SSD become even less of an issue as the technology matures over the next couple of years?
Starcub - Tuesday, September 8, 2009 - link
"So, is the 10 year 'lifespan' even going to be an issue with archival storage for most people?"No, but who takes wads of money out of their wallet to store it on their shelf?
smegforbrain - Tuesday, September 8, 2009 - link
"No, but who takes wads of money out of their wallet to store it on their shelf?"That is simply assuming that they will remain as expensive as they are now. They won't.
BlackSphinx - Sunday, September 6, 2009 - link
Hello! I'm taking the time to comment on this article, because I am very thankful for all of these awesome write-ups on SSD.I'm in the process of building an heavily overclocked i7 rig for gaming and video edition, and I was going to jam 2 Velociraptors in Raid0 in there. Why? I had only heard bad things about SSDs in the past.
Reading your aticles, who are, while in depth, very clear and easy to understand, I understand much better what happened in early SSDs, what's so good about recent Indilinx and Intel SSD, and, truly, why I should forgo mechanical drives and instead go the SSD route (which, frankly, isn't more costly than a Raid0 raptor setup). In short, these articles are a great service to the end users just like myself, and if they were intended as such, you have passed with flying colors. Congratulations and thanks.
Transisto - Sunday, September 6, 2009 - link
Could someone reset my brain as to why there is no way to get a (very noticeable) improvement from USB thumb-drives. I mean these thing also get 0.1 ms latency.It's a bit extreme but for the same price I could get 9 cheap 8gb SLC usb drive for around 20$ each and put them in three separate PCI-USB add-on card (5$)
They would saturate the USB controler with 3 drive in it so I Could get around 140mb/s read and 60mb/s write.
Say you manage to merge that into a raid or ... ? Is eboost or Readyboost any good at scaling up ?