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holmes4 holmes4 is offline
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Default Long but interesting AnandTech article on SSD performance - 03-18-2009, 07:52 PM

This article goes into great detail about performance differences due to controller chips and the "SSD slowdown effect". It is a VERY long article but worth the read.

http://www.anandtech.com/storage/showdoc.aspx?i=3531


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MoInSTL MoInSTL is offline
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Default Re: Long but interesting AnandTech article on SSD performance - 03-18-2009, 09:46 PM

thanks for the link.


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cazlar cazlar is offline
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Default Re: Long but interesting AnandTech article on SSD performance - 03-18-2009, 11:55 PM

A very interesting read (but long as you say)! Now I wonder how do the numbers and benchmarks mentioned compare to the STEC and Runcore drives in the mini 9? I guess I'll have to hunt down some results by others.
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jergarmar jergarmar is offline
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Default Re: Long but interesting AnandTech article on SSD performance - 03-19-2009, 04:36 AM

What an amazing article. It's more than an article -- it's like a primer on SSDs with some history thrown in for good measure. It does eventually focus on the OCZ drives, but even then the generally-applicable knowledge flows in a steady stream.

It has a great description of the "stutter" problem of some SSDs (with visuals). It describes the importance of the controller. It describes why they're better than conventional hard drives (i.e. random reads). It reveals the shift in thinking that some SSD manufacturers haven't been able to grasp. It describes the degraded performance that SSDs will have over time, and how to restore it like new. It shows why benchmark tests like Atto only tell part of the story. It describes why SSDs are good with Vista.

One of the most informative and interesting technical articles i have ever read.
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Fallstar Fallstar is offline
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Default Re: Long but interesting AnandTech article on SSD performance - 03-19-2009, 04:50 AM

Great article Steve, thanks for the link.
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drizek drizek is offline
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Default Re: Long but interesting AnandTech article on SSD performance - 03-19-2009, 04:53 AM

I started a benchmark thread but I can't figure out how to use the benchmarking app. viewtopic.php?f=11&t=5353&p=44198#p44198
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JonAHupp JonAHupp is offline
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Default Re: Long but interesting AnandTech article on SSD performance - 03-19-2009, 05:23 PM

Anyone know which controller the RunCore and Standard Dell SSD use?
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jergarmar jergarmar is offline
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Default Re: Long but interesting AnandTech article on SSD performance - 03-19-2009, 07:03 PM

Quote:
Originally Posted by JonAHupp
Anyone know which controller the RunCore and Standard Dell SSD use?
Words cannot express how much I also want to know the answer to this question.

However, a bit of the answer has probably already been discovered. Here's an example, from CrystalDiskMark from this post.

STEC 16GB:
Code:
   Sequential Read :   77.638 MB/s
  Sequential Write :   11.598 MB/s
 Random Read 512KB :   70.559 MB/s
Random Write 512KB :    2.590 MB/s
   Random Read 4KB :    9.362 MB/s
  Random Write 4KB :    0.232 MB/s
RunCore 16GB:
Code:
   Sequential Read :   84.169 MB/s
  Sequential Write :   26.071 MB/s
 Random Read 512KB :   79.542 MB/s
Random Write 512KB :   20.420 MB/s
   Random Read 4KB :   10.959 MB/s
  Random Write 4KB :    1.859 MB/s
According to the article, the "Random Write 4KB" are REALLY important. I don't know about how CrystalDiskMark gets it's numbers, but if the numbers are somewhere in the GENERAL vicinity of accurate we see why the Runcores are better: yes the sequential writes are better (i.e. installing programs) but the "Random Write 4KB" for the Runcore is almost an order of magnitude faster than the STEC (same for the "Random Write 512KB"!). Wow! The critical verification of this that we do NOT have is the latency.

BUT even the stock STEC has a random 4kb read of 9MB/sec, which is really amazing if you think about it. That demolishes the best conventional hard drives.

EDIT: I meant to include this bit of data: the VelociRaptor (one of the speediest conventional drives) has a random 4kb write speed of 1.63MB/sec. Some SSDs are better than this but cheap ones can be MUCH worse. The Runcore looks approximately equivalent to the VelociRaptor in this specific benchmark, so that's a good sign.

EDIT2: minor edit to fix an misleading sentence.
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drizek drizek is offline
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Default Re: Long but interesting AnandTech article on SSD performance - 03-19-2009, 07:22 PM

I have run the benchmark on my 4GB STEC and the latency is 300ms average and 1s maximum, basically quite a bit better than the JMICRON drives, but not really adequate.

See my post above for the thread with instructions on how to run Iometer.
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loooney2ns loooney2ns is offline
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Default Re: Long but interesting AnandTech article on SSD performance - 03-21-2009, 01:34 PM

A great article and very educational. I now have an understanding of these drives which I didn't have before. Thanks!


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