Anyone running raid 0 ssds?

Discussion in 'Mac mini' started by crazzapple, Nov 17, 2014.

  1. crazzapple Guest

    Joined:
    Oct 19, 2014
    #1
    With the price of high end ssds (Samsung 850 pro 256 GB $170) rapidly dropping, I'm considering running two of these in a raid ) config. Anyone doing this? What kind of speeds should be expected?

    Sounds like a real nice upgrade for $340US.
     
  2. Crosscreek macrumors 68030

    Crosscreek

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    #2
    I seen some people early this year doing it with 840 250GB Evos and they were getting over 1k read and writes in raid 0.
     
  3. cinealta macrumors 6502

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    Dec 9, 2012
    #3
    Hopefully you'll see > 1 Tb/s or on par with PCIe-SSD.
     
  4. Mr. Retrofire macrumors 601

    Mr. Retrofire

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    #4
    You mean probably 1000 MByte/s not 1 kByte/s.

    One Terabit/s (Tb/s)
    = 1000.000.000.000 bits/s
    / 8
    = 125.000.000.000 Byte/s
    / 1000.000
    = 125.000 MByte/s

    Conclusion: You use a SSD from the future! ;-)
     
  5. Crosscreek macrumors 68030

    Crosscreek

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    #5
    yep :cool:
     
  6. scottsjack macrumors 68000

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    #6
    Please tell how to set up two internal SSDs as a RAID 0.
     
  7. cinealta macrumors 6502

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    Dec 9, 2012
    #7
    See directions for creating a "striped" RAID set:

    http://support.apple.com/kb/ph5834
     
  8. qcmacmini macrumors 6502

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    The Netherlands
    #8
    If you read most articles on this, it doesn't bring real world benefits, unless you need to edit/playback 4k video. Sequential benchmarks don't really help in usual daily tasks unless you copy big files.

    I went with a single 1TB 850 PRO and my mac mini is insanely fast compared to the spinner, everything is just about instantaneous.
     
  9. scottsjack macrumors 68000

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    #9
  10. macaron95 macrumors regular

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  11. cinealta macrumors 6502

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    Dec 9, 2012
    #11
    LOL, yes you're right!
     
  12. crazzapple thread starter Guest

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    Oct 19, 2014
    #12
    That is a good point. I guess it would also increase the chance of a failure since there are two instead of one, even if it's a small chance.

    ----------

    Nice!
     
  13. qcmacmini macrumors 6502

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    #13
    Yeah exactly, also your 4k random speeds will be identical, plus you're adding the extra point of failure.

    I had the choice of two cheaper SSDs in RAID, or one top end SSD, and went for the latter.
     
  14. cinealta macrumors 6502

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    Dec 9, 2012
    #14
    Two top end SSDs in RAID 0 would be even better.
     
  15. macaron95 macrumors regular

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    May 5, 2014
    #15
    it all depends if you choose performance or safety
     
  16. qcmacmini macrumors 6502

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    #16
    I don't know, it makes more sense to buy a Macbook Pro 15" with 1TB x4 PCIe SSD. Two 1TB Samsung 850 PROs would cost stupid money for a mac mini build, and you're still left with HD4000 graphics.
     
  17. cinealta macrumors 6502

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    Dec 9, 2012
    #17
    True. Good points.
     
  18. Mr. Retrofire macrumors 601

    Mr. Retrofire

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    #18
  19. qcmacmini macrumors 6502

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    #19
    Samsung quote 2 million hours MTBF for the 850 Pro, and also for the enterprise SSDs you linked to.

    Explain to me how the reliability is better with the enterprise models.
     
  20. Mr. Retrofire macrumors 601

    Mr. Retrofire

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    #20
    The 850 Pro can write up to 150 TB data to the flash memory:
    http://www.samsung.com/global/busin...nt/Samsung_SSD_850_PRO_Data_Sheet_rev_1_0.pdf

    The 240 GB MZ7WD240HCFV Enterprise SSD can write up to:
    1.8 * 240 GB = 432 GByte each day for 5 years (see datasheet) data to the flash memory.

    365 days * 5 years * 432 GB = 788400 GB ≈ 788 TBW*

    The 1.8 Drive Writes Per Day are the minimum. Samsung lists also 5.4 and 11 Drive Writes Per Day (see datasheet)


    *TBW:
     
  21. qcmacmini macrumors 6502

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    #21
    The endurance rating has nothing to do with reliability in a consumer sense. I highly doubt anyone here will write 788TB to their drive.

    I'm not saying that drive doesn't have it's application in enterprise data centres, but saying that putting that in a Mac Mini in someone's house under the premise of improved reliability is misleading.

    99.999% of home and business users will experience the same reliability between those drives and an 850 PRO.
     
  22. Mr. Retrofire macrumors 601

    Mr. Retrofire

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    #22
    Wrong.

    ----------

    Source?

    ----------

    It is the truth and not misleading. Not everyone ignores the facts and is a single user @ home.
     
  23. qcmacmini macrumors 6502

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    #23

    Well, MTBF is the same on both.

    You're implying that home users may write over 700TB.

    I say this is highly unlikely.

    Endurance is simply a wear out curve, and doesn't come into play.

    My reasoning is that for a home user you would have long upgraded your machine before this comes into play.
     

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