The SSD Anthology: Understanding SSDs and New Drives from OCZ
by Anand Lal Shimpi on March 18, 2009 12:00 AM EST- Posted in
- Storage
OCZ Tries Again with the Vertex
This is Ryan Petersen:
He’s the CEO of OCZ Technology. He wasn’t too happy after my Intel X25-M SSD review.
Although that review was about the X25-M, it addressed a major shortcoming with a number of other SSDs in the market - the most popular at the time being OCZ’s Core line.
The problem with the Core line was that although they were competitively priced, they had a major performance issue: small file write latency. The problem manifested itself in system-wide stuttering during disk intensive multitasking. It wouldn’t take a lot to make those drives stutter, and until that article went live, everyone assumed that the problem was Windows, the disk controller, or something else.
I placed the blame on the drives and Ryan wasn’t all too happy.
We argued. A lot. He claimed it was unfair that I was comparing the Core series to Intel’s far more expensive X25-M; I argued that the user experience offered by his drives was inferior to that of a regular hard drive. We never really saw eye to eye on SSDs after that article.
Ryan told me the problem was a lack of cache, and that they’d have a future version of their SSD with a large off-chip DRAM cache. Ryan did not want to send me any more SSDs that didn’t have a cache on them. It wasn’t just OCZ, we had difficulty getting JMicron based SSDs from most manufacturers after that article. Manufacturers were pissed.
I offered to look at any new SSDs they had coming, regardless of who made the controller. But I made one thing very clear - I did not believe that the JMicron based drives were fit for sale. I felt that they were hurting the image of SSDs in the market and doing more harm than good. Ask any of the major players in the flash and OS industries and you’ll hear the same complaint. We need good SSDs in the market, not a mixture of great ones and bad ones.
In early December I got word from OCZ that their first drive with a DRAM cache was nearing final production. The controller was from a Korean company called Indilinx, with a number of ex-Samsung engineers. JMicron was out for this product, they didn’t have a suitable controller - the JMF602B was it. I won’t draw too much attention to the fact that if the JMF602B drives were indeed fine then there would be no need to consider another controller manufacturer.
The Indilinx Barefoot controller would support up to 64MB of off-chip DRAM, but have no on-die cache. All user data would be buffered in this memory. Now 64MB is more than enough to handle anything being written to the drive, but the memory is also used for the ARM7 based processor for its work in dealing with wear leveling and flash block cleaning (removing invalid pages).
There’s a key distinction here between the Barefoot and Intel’s controller - the X25-M doesn’t store any user data in its DRAM. Technically the Barefoot approach is no less prone to dataloss than a standard hard drive, but the Intel approach is a bit better. In the event of sudden power loss there’s a chance that some of the data in the Barefoot’s 64MB buffer could be lost before it’s committed to flash.
The OCZ Vertex drive would have a more heavy duty controller, with an ARM processor and a large off-chip DRAM to improve performance. To top it all off, OCZ would sell it at a price much lower than Intel’s X25-M. Could this finally be the affordable SSD we’ve been looking for?
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GlItCh017 - Wednesday, March 18, 2009 - link
I just wanted to comment that the backstory portion to this article is simply the most interesting part to an article (or almost even an article inside the main article). On top of that, it is easily the most interesting article I have ever read simply because of that section. Really really must say that I enjoyed reading it!radguy - Wednesday, March 18, 2009 - link
I have been waiting for this one for a while and it was very informative. Thank you very much for it. I did pick up one of the patriot warp drives for my netbook. I was really happy until I installed avg free. So not running an antivirus on it anymore but I have drive image backup incase it goes bad. Overall pretty happy as it was only 80 bucks if I get my mir.I think I'm going to wait until windows 7 till I upgrade my primary desktop. 2 of those vertexs in raid 0 would be sweet though.
sleepeeg3 - Wednesday, March 18, 2009 - link
They were one of the first SSDs you reviewed and they use their own controller. How does their random write performance compare to everything else out now?These reviews made me totally reassess the purchase of the two Samsungs I bought. I had no idea the random writes on the Samsung drives were so bad. Other reviews show the Samsung drives doing better or at least near the X25-M in write tests: http://www.techreport.com/articles.x/15433/6">http://www.techreport.com/articles.x/15433/6 However, those tests probably would have been somewhat sequential.
nubie - Wednesday, March 18, 2009 - link
Grammatically awkward sentence on Page 21:"so if you own one of these drives - you owned a fixed version."
The tense is incorrect (own/owned). I think "own a fixed version" is still awkward, perhaps "you have the fixed version", also the "so" may be superfluous. You can replace the ", so if" with a "; if". Here is how I might re-write the sentence:
"The old firmware never shipped thanks to OCZ's quick acting; if you own one of these drives - you have a fixed version."
(I am not an expert, so feel free to correct me if I am wrong.)
Awesome article btw, thanks for setting me straight on SSD, I have been steering clear of them. I hope soon you can review SSD's and most are good to excellent. :)
Flyboy27 - Wednesday, March 18, 2009 - link
This article has answered every question I've had regarding SSDs recently. Thanks Anand!Flyboy27 - Wednesday, March 18, 2009 - link
If a 120gb Vertex was around $250 I would get one yesterday. I suppose I can wait though.7Enigma - Thursday, March 19, 2009 - link
For me, 2 60's or 2 80's for around that price and I'm sold. Want the Raid0.kgwagner - Wednesday, March 18, 2009 - link
I almost didn't read this article, as everybody and their brother seems to want to explain SSDs these days and most of the articles aren't much more than glorified press releases. But, this one truly took the drives to task and presented some valid information and explanations about the state of the art and where it needs to go. Kudos, Anand. Awesome show. Good job.Mr Perfect - Wednesday, March 18, 2009 - link
"Needless to say, there was some definite fallout from that review. I’m used to negative manufacturer response after a GPU review, but I’m always a bit surprised when it happens in any other segment."Obviously you can't make a business out of irritating manufacturers, but when there really are issues, the readers want to know about them. After all, that's why we come here!
gwolfman - Wednesday, March 18, 2009 - link
You own Anand. Keep up the good work. I've seen you cited from many sites about the work you've done, in particular with SSDs. Best article I've read in months!