PCIE M.2 NVMe on MacPro

Discussion in 'Mac Pro' started by superparati, Feb 2, 2017.

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  1. h9826790 macrumors G4

    h9826790

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    #176
    TRIM should only affect write speed, but not read speed.

    Something is very wrong with that read speed on a NVMe SSD.
     
  2. sirroderick macrumors newbie

    sirroderick

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    #177
    Sorry my mistake it's the write speed that's slow. I wonder if it's the WD device. most people seem to use Samsung SSDs. but it is SO slow that it does seem like a trim issue
    --- Post Merged, Jun 13, 2018 ---
    Also as an experiment i tried it in slot 2 (x16) and the write speed remained at 200 but the read speeds went down to 700. Not what I expected at all.
     
  3. h9826790 macrumors G4

    h9826790

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    #178
    I think it's TRIM issue.

    You may need to turn ON TRIM, boot into recovery partition, then Run first aid in disk utility to manually TRIM the SSD.

    Just turn TRIM ON won't help if the SSD is already "dirty" and "full". You need to manually TRIM it in order to let it free up the cell for next high speed write in operation.
     
  4. LightBulbFun macrumors 68000

    LightBulbFun

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    #179
    you know as they say

    sometimes you just gotta fsck it :D

    if the SSD is formatted as HFS+ and you have trim enabled

    then running fsck in Single user mode before you mount the drive, will manually trim the SSD :)
     
  5. sirroderick macrumors newbie

    sirroderick

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    #180
    Thanks for that but I'm afraid it made no difference. I also ran trimforce enable in the terminal once more to be sure. First aid ran but didn't give a report or anything but since the disk was yet to be written to (except for Black Magic's temp file of course) it probably wouldn't have done much. Maybe the Lycom card doesn't support this particular drive. I'm pretty sure I checked that before I bought but I'll check again.
    --- Post Merged, Jun 13, 2018 ---
    Ah! now we might be getting to it. I was advised to format APFS. Is this not the way to go?
     
  6. LightBulbFun macrumors 68000

    LightBulbFun

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    #181
    are you booting from this NVMe drive or?

    when in single user mode

    fsck -fy

    will check/fix up the Boot/Root Device it is possible to run fsck on other drives however i have not looked into that. so i cant tell you how currently.

    the reason I mentioned HFS is when an SSD is APFS formatted running fsck no longer manually trims the blocks sadly. (or it does not appear to do so)
     
  7. h9826790 macrumors G4

    h9826790

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    #182
    Go for HFS+, APFS bring you more headache than happiness.
     
  8. sirroderick macrumors newbie

    sirroderick

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    #183
    Tried to reformat to HFS+ but it no longer seems to be an option
    Doesn't seem to be possible once formatted to APFS unless I'm missing something
     
  9. h9826790 macrumors G4

    h9826790

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    #184
    Make sure you select the drive, not the partition. You can't format a drive inside a partition.
    Screen Shot 2018-06-13 at 21.19.38.png
     
  10. sirroderick macrumors newbie

    sirroderick

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    #185
    ran fsck -fy
    It just seemed to just check the OS HD as far as I can see. All the same I'm afraid. NVMe doesn't exactly seem plug and play on Mac Pro 5,1s -or maybe I'm just unlucky.
    I wasn't planning on attempting to use this to boot from. I'd just just be happy to get it writing at a reasonable speed.
    OK after a bit googling it seems that once you've booted in recovery mode HFS+ is no longer an option.
     
  11. h9826790 macrumors G4

    h9826790

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    #186
    You have to boot from another drive. As I said, you cannot format a drive if you already inside a partition (you boot from a partition). And you can't format your boot drive.

    But if you boot from another drive's recovery partition. You can format your APFS SSD back to HFS+.
     
  12. sirroderick macrumors newbie

    sirroderick

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  13. LightBulbFun macrumors 68000

    LightBulbFun

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    #188
    click view then "show all devices"

    then you will see the actual SSD it self then you can format it as whatever :)

    (I know Modern disk utility sucks...)
     
  14. sirroderick macrumors newbie

    sirroderick

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    #189
    Don't quite understand your point I'm booting from a regular HD
    --- Post Merged, Jun 13, 2018 ---
    Ok got you but I'm still not seeing HFS+ just MacOS extended and some FAT stuff
    --- Post Merged, Jun 13, 2018 ---
    Untitled.png
     
  15. h9826790 macrumors G4

    h9826790

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    #190
    MacOS Extended is HFS+
    --- Post Merged, Jun 13, 2018 ---
    And that's exactly why I made post #184 to ask you to choose the drive but not the partition.
     
  16. sirroderick macrumors newbie

    sirroderick

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    #191
    OK it's just that when I first formatted a couple of days ago the option appeared as HFS+, anyway I went for macOS Extended (journaled) and its still showing 200 MB/sec write
    --- Post Merged, Jun 13, 2018 ---
    Thanks for you infinite patience BTW
     
  17. h9826790 macrumors G4

    h9826790

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    #192
    So, the NVMe SSD is now newly formatted to HFS+. And you confirmed TRIM is activated in system info?
    Screen Shot 2018-06-13 at 22.49.16.png
     
  18. sirroderick macrumors newbie

    sirroderick

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    #193
    Ok well that's different... mine doesn't appear under the SATA/SATA Express heading, just NVMExpress
    Untitled 2.png
    --- Post Merged, Jun 13, 2018 ---
    This was the case after I first put the card in 2 days ago.
    --- Post Merged, Jun 13, 2018 ---
    Software? SSD? Card? Mac Pro? I haven't a clue
    Is it worth installing a new copy of the OS on a fresh disk?
     
  19. h9826790 macrumors G4

    h9826790

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    #194
    I just check your SSD's spec and review. 200MB/s sequential write may be normal indeed. Even the 512GB model can only do 300MB/s in real world test.
    image.png
     
  20. crjackson2134 macrumors 68040

    crjackson2134

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  21. h9826790 macrumors G4

    h9826790

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    #196
    Yes it is. I really didn't expect that.
     
  22. sirroderick macrumors newbie

    sirroderick

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    #197
    Jeez where was that chart when I needed it. Guys I've wasted your time and I'm really sorry about that. I can see why the 960 leads the pack.
    --- Post Merged, Jun 13, 2018 ---
    On the Scan site it says 700MB/sec. I'm asking for money back.
     
  23. h9826790 macrumors G4

    h9826790

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    #198
    May be you can only achieve that 700MB/s under very specific condition. I don't know. But so far, this doesn't looks like a good choice for NVMe SSD.

    For me, the sole reason to go PCIe SSD is the sequential speed. And this model fail to deliver.

    If I only want low latency, SATA SSD is good enough.
     
  24. rdkodas macrumors newbie

    rdkodas

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    Jun 25, 2018
    #199
    I install SSD Screen Shot 2018-06-25 at 20.41.49.png Screen Shot 2018-06-25 at 20.43.05.png

    on Mac Pro 2009 5.1

    and not boot from this ssd
     
  25. Ram242 macrumors newbie

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    Jul 26, 2018
    #200
    Hi,

    can someone tell me how long does your Mac needs from hearing the start sound till you see the desktop if you boot from a NVMe drive?
     

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