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Thread: SSD Write Endurance 25nm Vs 34nm

  1. #1326
    Admin Vapor's Avatar
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    Charts Updated

    All bar charts are sorted by their respective equivalent of Writes So Far. SF-1200 MWI Exhaustion expectation is overly optimistic due to me still running compression tests (and 0-fill was redone after it went below 100MWI)....it will probably always be optimistic until MWI does deplete. SF-1200 observed WA is also optimistic, for the same reasons.

    Host Writes So Far

    Aug15HostBar.png

    Aug15HostLine.png


    Normalized Writes So Far
    The SSDs are not all the same size, these charts normalize for available NAND capacity.

    Aug15NormBar.png

    Aug15NormLine.png


    Write Days So Far
    Not all SSDs write at the same speed, these charts factor out write speeds and look at endurance as a function of time.

    Aug15WDBar.png

    Aug15WDLine.png


    Host Writes vs. NAND Writes and Write Amplication
    Based on reported or calculated NAND cycles from wear SMART values divided by total writes.

    Aug15WrLin.png

    Aug15WrLog.png

    Aug15WrtAmp.png

  2. #1327
    Xtreme Addict bluestang's Avatar
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    M225->Vertex Turbo 64GB Update:

    81.16 TiB
    387 hours
    MWI 51 (drops by 1 for every 50 raw wear)
    2451 Raw Wear
    110.71 MB/s avg for the last 15.5 hours (on W7 x64)
    MD5 OK

    CDI-M225-OCZ-VERTEX-TURBO-08.16.2011.PNG

    EDIT: And just think, my CD - Max PE Count Spec should be 10,000 for this NAND.
    Last edited by bluestang; 08-16-2011 at 07:20 AM.
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  3. #1328
    SynbiosVyse
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    05: 0
    B1: 11
    E7: 92%
    E9: 16832
    EA/F1: 29312

    66.60 hours
    28.5219 TiB
    58.52 MB/s avg
    MD5 Ok

  4. #1329
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    m4 update:

    311.0004 TiB
    1026 hours
    Avg speed 89.48 MiB/s.
    AD gone from 179 to 175.
    P/E 5447.
    MD5 OK.
    Still no reallocated sectors

    M4-CT064 M4SSD2 SATA Disk Device_1GB-20110816-2230.PNG
    1: AMD FX-8150-Sabertooth 990FX-8GB Corsair XMS3-C300 256GB-Gainward GTX 570-HX-750
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    3: Asus U31JG - X25-M G2 160GB

  5. #1330
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    Quote Originally Posted by johnw View Post
    433.397 TiB, 1175 hours, sa177: 1/1/35458, sa178: 55/55/452, 111.30 MB/s
    442.500 TiB, 1200 hours, sa177: 1/1/36204, sa178: 51/51/496, 110.23 MB/s

    The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

    64GB Samsung 470

  6. #1331
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    Quote Originally Posted by johnw View Post
    442.500 TiB, 1200 hours, sa177: 1/1/36204, sa178: 51/51/496, 110.23 MB/s

    The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

    64GB Samsung 470
    If a drive with WA of 5 is able to write 0.5PB of data, is it fair to assume that the drive of the same size and NAND with WA of 1 will be able to write > 2PB of data? That would push these babies into enterprise land.

  7. #1332
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    @vapor

    I'm wonder about something. How do you calculate the WA in the charts?
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    3: Asus U31JG - X25-M G2 160GB

  8. #1333
    SynbiosVyse
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    05: 0
    B1: 12
    E7: 92%
    E9: 17792
    EA/F1: 30464

    72.15 hours
    29.6435 TiB
    58.54 MB/s avg
    MD5 Ok

  9. #1334
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    Quote Originally Posted by B.A.T View Post
    @vapor

    I'm wonder about something. How do you calculate the WA in the charts?
    For the SF-1200s, I divide NAND writes by host writes reported by SMART attributes.

    For the M225/C300/m4/Samsung470, I take ( reported raw wear ) / ( reported host writes (either SMART attribute or user reported) * 1024 / 64 ) (all drives are 64GiB NAND and 64GB available, so the 64 is applicable to all of them)

    For the Intel X25-V with 5000 cycle NAND, I take ( 50 * (100-MWI) ) / ( user reported host writes * 1024 / 40 )

    For the Intel 320 with 3000 cycle NAND, I take ( 30 * (100-MWI) ) / ( user reported host writes * 1024 / 40 ) (yes, it has 48GiB of NAND, but we don't know the parity scheme so only basing it on 40)


    For instantaneous/recent WA, I just change the numerator and denominator to represent the change in the inputs from the most recent update(s).

    All write amplification figures I list are just what WA appears to be from the data that's reported...if there's an error in the input, there's an error in the output.

  10. #1335
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    Thank you! That fills up some of my knowledge gaps.
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  11. #1336
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    314TiB. 58 reallocations. MD5 OK.

    The available reserve space and the erase fail count both dropped down to 99 from 100. This happened either at 57 or 58 reallocated sectors.

  12. #1337
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    Extrapolated out that's 5600-5800, depending how they count...weird numbers

    Of course, it is pretty inappropriate of me to extrapolate just on the smallest change possible

    On a somewhat related topic, I wonder how big an Intel sector is this context....an LBA sector, a page, a block, or some other unit?

  13. #1338
    Uber Raid King Computurd's Avatar
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    @Anvil or Vapor-
    could you guys update charts on post #1? i have been linking this quite a bit and it makes it easier for others to see results on first post
    "Lurking" Since 1977


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  14. #1339
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    M225->Vertex Turbo 64GB Update:

    87.51 TiB
    402 hours
    MWI 49 (drops by 1 for every 50 raw wear)
    2571 Raw Wear
    110.75 MB/s avg for the last 16.7 hours (on W7 x64)
    MD5 OK

    EDIT: C4 Erase Failure Block Count went from 0 to 1. (missed that, sorry)

    CDI-M225-OCZ-VERTEX-TURBO-08.17.2011.PNG
    Last edited by bluestang; 08-17-2011 at 12:26 PM. Reason: SMART
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  15. #1340
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    Quote Originally Posted by johnw View Post
    442.500 TiB, 1200 hours, sa177: 1/1/36204, sa178: 51/51/496, 110.23 MB/s
    450.872 TiB, 1223 hours, sa177: 1/1/36889, sa178: 43/43/574, 108.21 MB/s

    The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

    64GB Samsung 470

    At this rate (sa178), may only have a few days left...
    It is slowing down a little, too. Maybe because of less reserved space.

  16. #1341
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    C300 Update

    219TiB host writes, 26MWI, 3702 raw wear, 2048/1 reallocations, 62.5MiB/sec, MD5 OK


    SF-1200 nLTT Update

    92.625TiB host writes, 60.719TiB NAND writes, 72 MWI, 971.5 raw wear (equiv), 56.35MiB/sec, MD5 OK



    Quote Originally Posted by Computurd View Post
    @Anvil or Vapor-
    could you guys update charts on post #1? i have been linking this quite a bit and it makes it easier for others to see results on first post
    Thanks for the reminder, will get to it after this post

    Quote Originally Posted by johnw View Post
    450.872 TiB, 1223 hours, sa177: 1/1/36889, sa178: 43/43/574, 108.21 MB/s

    The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

    64GB Samsung 470

    At this rate (sa178), may only have a few days left...
    It is slowing down a little, too. Maybe because of less reserved space.
    Also of interest, your overall WA has decreased when sa178 started increasing. It was a very steady 5.14x before sa178 went on the move and now it's down to 5.11x overall. Since sa178 started moving, recent WA has been mostly steady at 5.075x.

    Yes, pretty small change, but the considering the previous stability, the suddenness, and the timing of this change I find it very interesting.

    Also, the reallocation line took a very noticeable turn upward...I agree that it may only have a few days left.

  17. #1342
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    m4 update:

    319.0516 TiB
    1052 hours
    Avg speed 89.49 MiB/s.
    AD gone from 175 to 170.
    P/E 5589.
    MD5 OK.
    Still no reallocated sectors

    M4-CT064 M4SSD2 SATA Disk Device_1GB-20110818-0040.PNG
    1: AMD FX-8150-Sabertooth 990FX-8GB Corsair XMS3-C300 256GB-Gainward GTX 570-HX-750
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  18. #1343
    Registered User Hopalong X's Avatar
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    One_Hertz

    FYI

    http://communities.intel.com/thread/24205

    Intel has the firmware update available if interested. It took me about 10 minutes total.
    Mike
    Last edited by Hopalong X; 08-17-2011 at 02:58 PM.

  19. #1344
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    Quote Originally Posted by johnw View Post
    450.872 TiB, 1223 hours, sa177: 1/1/36889, sa178: 43/43/574, 108.21 MB/s
    454.959 TiB, 1234 hours, sa177: 1/1/37220, sa178: 39/39/620, 108.10 MB/s

    The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

    64GB Samsung 470

    Two updates today.

  20. #1345
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    Quote Originally Posted by johnw View Post
    454.959 TiB, 1234 hours, sa177: 1/1/37220, sa178: 39/39/620, 108.10 MB/s

    The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

    64GB Samsung 470

    Two updates today.
    The question is if it will break the 500TiB barrier or break before it?

  21. #1346
    Xtreme Addict bluestang's Avatar
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    M225->Vertex Turbo 64GB Update:

    93.58 TiB
    416.5 hours
    MWI 47 (drops by 1 for every 50 raw wear)
    2687 Raw Wear
    110.92 MB/s avg for the last 16 hours (on W7 x64)
    MD5 OK
    C4-Erase Failure Block Count(Realloc Sectors) at 1 (BANK 6, Block 2406, Erased 2552 times)

    CDI-M225-OCZ-VERTEX-TURBO-08.18.2011.PNG
    Last edited by bluestang; 08-18-2011 at 09:50 AM.
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  22. #1347
    SynbiosVyse
    Guest
    05: 0
    B1: 17
    E7: 87%
    E9: 24576
    EA/F1: 38912
    F2: 64

    112.97 hours
    37.8914 TiB
    58.65 MB/s avg
    MD5 Ok

  23. #1348
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    Quote Originally Posted by devsk View Post
    The question is if it will break the 500TiB barrier or break before it?
    Such questions are rather arbitrary. It has already passed 500TB, for example.

  24. #1349
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    Quote Originally Posted by johnw View Post
    Such questions are rather arbitrary. It has already passed 500TB, for example.
    What I meant was that death counter (we don't know for sure if it is so but still) is going down fast, almost 1 per TiB. So, its really a stretch if it makes it past 500TiB.

  25. #1350
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    Quote Originally Posted by johnw View Post
    454.959 TiB, 1234 hours, sa177: 1/1/37220, sa178: 39/39/620, 108.10 MB/s
    460.056 TiB, 1249 hours, sa177: 1/1/37631, sa178: 32/32/684, 107.43 MB/s

    The other unknown SMART attribute 235 is still at 99/99/2, just as it was when the SSD was fresh out of the box.

    64GB Samsung 470

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