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Thread: SSD Write Endurance 25nm Vs 34nm

  1. #1101
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    Quote Originally Posted by Vapor View Post
    It burned through its MWI SMART attribute very quickly through an apparent write amplification of ~5x (which is why it looks 'bad' in many charts), but it's still going strong having written its formatted size (64GB) over 4000 times (enough for writing 64GB/59.6GiB per day for ~11 years)

    Thats good to know. I wonder, is it possible the MWI attribute isnt calibrated/programed properly or something like that for the Samsung drive? Which is why the number ran out so fast, yet the NAND appears to be perfectly fine and going strong?
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  2. #1102
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    Quote Originally Posted by Ao1 View Post
    Nice to see this, especially as writes are far exceeding MWI. Would something like this not be more easy to visualise?
    I've been playing with it awhile, and this is as good as I can make it and I don't personally like it....but if others do I'll start including it

    ProtoBar.png

  3. #1103
    Registered User Hopalong X's Avatar
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    Vapor

    It is easy to read the results. +1

  4. #1104
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    Quote Originally Posted by Vapor View Post
    I've been playing with it awhile, and this is as good as I can make it and I don't personally like it....but if others do I'll start including it
    I like it better than the line chart of the same data.

  5. #1105
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    Alright, new chart is in then I'll figure out a way to fix the parts I don't like

  6. #1106
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    Yeah Vapor I like the new chart...even I can read it and understand it!
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  7. #1107
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    I too like the new chart as it is much easier to read. The other chart made the Samsung look like a POS, in this new chart it shows that the MWI does indeed wear out faster on the top drives, yet they are still able to perform successful writes even after the SMART attribute is done.

    Something interesting I noticed on that Samsung on top. You are testing a 60GB drive, and the MWI lasted pretty much right at 60GB. Coincidence?


    According to that chart the drives look like they last significantly past the MWI value. I havent read every single post in this thread but I have been skimming it since the beginning so IDK if this has been asked yet or not. But with your program, are you actually checking to make sure the write that is done is able to be read back successfully? Or is it just writing data without verifying all the data is written properly?
    Last edited by EniGmA1987; 07-27-2011 at 11:32 AM.
    Rig 1:
    ASUS P8Z77-V
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    16GB of Mushkin DDR-1866 RAM (8-9-8-26-1T)
    AMD 6950 with 6970 bios flash

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  8. #1108
    Xtreme Mentor Ao1's Avatar
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    Yes its being taken care of by Anvils app.

  9. #1109
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    As the chart is above....it only replaces "Host Writes So Far" because expected MWI Exhaustion is not included. New chart replaces both "MWI Exhaustion" bar graph and "Host Writes So Far" bar graph (and it has the spacing fixed, which was part of what was bugging me before)

    ProtoBar.png

    While this is more complicated (3 sets of data per bar), I think it's still readable as there's never more than 2 active sets of data per SSD.

  10. #1110
    Moderator Anvil's Avatar
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    Great chart Vapor

    I wondered what was bugging you with the previous chart, but this one is just great!
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  11. #1111
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    C300 Update

    112.775TiB, 1905 raw wear indicator, 62 MWI, 62MiB/sec, MD5 OK, reallocated still at 1 event/2048 sectors.

  12. #1112
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    Sweet chart Vapor, huge improvement over the other graph. Very easy to read.
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  13. #1113
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    i liked the other one

    LOL
    both are fine
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  14. #1114
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    Quote Originally Posted by johnw View Post
    247.432 TiB, 678 hours, sa177: 1/1/20345
    257.598 TiB, 705 hours, sa177: 1/1/21150

    Average speed reported by Anvil's app has been steady at about 112MB/s.

    The other two unknown SMART attributes, 178 and 235, are still at 72/72/276 and 99/99/2, just as they were when the SSD was fresh out of the box.

    64GB Samsung 470.

  15. #1115
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    Thanks for the graph updates Vapor !

  16. #1116
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    The new charts looks great Vapor

    M4 update. Almost there now. I think we will hit 1% during the day.

    167.3673 TiB
    561 hours
    Avg speed 88.77 MiB/s.
    AD gone from 6 to 3.
    P/E 2922.
    MD5 OK.

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  17. #1117
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    I really have no business poking my nose in here, but I've been lurking on this thread since the start, and I must say it's fascinating to follow. I hope all you guys get the recognition you deserve for your efforts.

    Question: What's the relationship between MWI exhaustion and PE cycles? When a drive's MWI is exhausted, does that mean the specified number of PE cycles for that type of NAND have been used? Is this a certainty or an assumption?

    Cheers!
    Last edited by virtualrain; 07-27-2011 at 11:18 PM.

  18. #1118
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    If you look at the charts you should be able to spot the relationship between MWI and P/E count, it's pretty close to the typical 3K or 5K cycles for 25nm and 34nm NAND.
    MWI looks to be set as a "worst case" scenario and the NAND might stay alive for a long time having exhausted MWI.

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  19. #1119
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    The really interesting bit will come when one of these drives fails and reports things like MD5 errors etc.

  20. #1120
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    Quote Originally Posted by johnw View Post
    257.598 TiB, 705 hours, sa177: 1/1/21150
    265.419 TiB, 726 hours, sa177: 1/1/21827

    Average speed reported by Anvil's app has been steady at about 112MB/s.

    The other two unknown SMART attributes, 178 and 235, are still at 72/72/276 and 99/99/2, just as they were when the SSD was fresh out of the box.

    64GB Samsung 470.

  21. #1121
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    WOW it really is incredible seeing the Samsung go on for so long !

  22. #1122
    Moderator Anvil's Avatar
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    Yeah, the Samsung is a real surprise.

    So, just think about what the 128GB drive could be capable of doing.
    I've been using my 128GB lately for benchmarks (and OS as well) and there are no signs of degrading performance.
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  23. #1123
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    And finaly are we there: 1% is no passed and the fun can begin

    172.3671 TiB
    577 hours
    Avg speed 88.76 MiB/s.
    AD gone from 3 to 1.
    P/E 3010.
    MD5 OK.

    M4-CT064 M4SSD2 SATA Disk Device_1GB-20110729-0104.png

    M4-CT064 M4SSD2 SATA Disk Device_1GB-20110729-0105.PNG
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  24. #1124
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    C300 Update

    118.378TiB, 60 MWI, 2000 raw wear, MD5 OK, 61.95MiB/sec, reallocation still at 2048/1.

    Now I'm the only one with drives that haven't exhausted their MWIs

  25. #1125
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    Cool and B.A.T is still at 0 reallocated sectors.
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