Problems with booting Apple SSUBX SSD on PCIe adapter

Discussion in 'Mac Pro' started by MisterAndrew, May 14, 2017.

  1. MisterAndrew, May 14, 2017
    Last edited: May 14, 2017

    MisterAndrew macrumors 6502a

    MisterAndrew

    Joined:
    Sep 15, 2015
    Location:
    Portland, Oregon
    #1
    Hello,

    I'm having some issues with booting my Mac Pro 5,1 from an Apple SSUBX SSD installed in a PCIe adapter. The SSD is Apple part # MZ-JPV2560/0A4 (655-1858H) and the PCIe adapter is this one: http://r.ebay.com/klbBjL.

    I have it installed in slot 4. When I boot after the chime is goes to the white/gray screen and hangs there for about 1 minute. Then it proceeds to boot as normal. When it's up and running it works fine and the speed test is good. But the hang up at the boot is annoying.

    I put it in slot 3 and when it's done hanging it just flashes the missing folder symbol. If I restart it holding the option key to select the boot drive that will come up and I can select it and it boots normally. I went into system preferences and made sure the drive is selected as the start up disk. But when I restart it does the same thing with the missing folder symbol. So that seems really strange. I put it back in slot 4 and it just has the hang up and boots normally again. I haven't tried putting it in slot 2.

    I've reset the PRAM, even 3 times in a row and it didn't change anything. But the computer wouldn't boot after I did the reset. It just had a black screen. I had to turn it off and unplug everything before it would boot again. Is that normal?

    Is there a way to tell if the SSD is good? I did a SMART test and that checks out without errors. I've also ran the Apple Hardware Test and it found no errors. Without purchasing another SSD, is there a way to tell if the adapter isn't good? I would prefer not to send the SSD back if it's good.
    --- Post Merged, May 14, 2017 ---
    I put it in slot 2 and it does not hang on boot. Is it normal for PCIe SSDs to act up in slots 3 and 4?
    --- Post Merged, May 14, 2017 ---
    So now I have a different problem. The speed test shows it's operating at half speed in slot 2.
     
  2. MisterAndrew thread starter macrumors 6502a

    MisterAndrew

    Joined:
    Sep 15, 2015
    Location:
    Portland, Oregon
    #2
    I'm pretty sure it's an issue with the adapter, but what can you expect for $4? :)

    If I was able to install a driver for the adapter chipset would that help it run in PCIe 2.0 mode in slot 2? Or it would it need some kind of EFI modification?
     
  3. h9826790 macrumors G3

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #3
    There is no chip set on the adaptor. It is pretty much really just an adaptor, not a convertor. No chipset required to convert anything, but allow some direct connection between the PCIe slots and the PCIe SSD's connector.

    Anyway, that half speed issue is a known bug. No fix yet.
     
  4. MisterAndrew thread starter macrumors 6502a

    MisterAndrew

    Joined:
    Sep 15, 2015
    Location:
    Portland, Oregon
    #4
    Hmm, okay. Thank you. Hopefully there'll be a fix soon. :)
     
  5. psaintemarie macrumors newbie

    psaintemarie

    Joined:
    Apr 29, 2018
    Location:
    Paris, France
    #5
    Jumping on this thread. I'm interested in knowing what's the best way to boot from a SSD installed a on PCIe adapter.
    I've seen info on the LyCom DT-120/DT-129 but could not find real info on the boot topic.

    @MisterAnd can you tell me more about your setup ? Are you able to boot on the SSD on your PCIe card ?

    Thank :)
     
  6. MIKX macrumors regular

    MIKX

    Joined:
    Dec 16, 2004
    Location:
    Japan
    #6
    Perhaps it should be in Slot 4.
    My Samsung 960 EVO M.2 showed the same behavior in slot 2. Boots OK now in slot 4 and at full speed

    What OS X version are you running? that always helps us to help you.
     
  7. psaintemarie macrumors newbie

    psaintemarie

    Joined:
    Apr 29, 2018
    Location:
    Paris, France
    #7
    I'm on 10.13.4, but I'll have to check the slot number. (don't have the Mac with me right now)
    I'll try slot 4 and see what happens !

    Thanks :)
     
  8. psaintemarie macrumors newbie

    psaintemarie

    Joined:
    Apr 29, 2018
    Location:
    Paris, France
    #8
    Just tried this morning. I can see/erase/format the disk just fine, but it seems I can't boot from it.
    I launch the macOS HS install, but it won't reboot on that ssd. I'm using slot 4 for the LyCom DT-129 PCI adapter.
     
  9. psaintemarie macrumors newbie

    psaintemarie

    Joined:
    Apr 29, 2018
    Location:
    Paris, France
    #9
    I also tried a restore after booting from a USB key, restoring the OS from a SATA drive. I can then select it as boot drive but it won't boot. And boot selector (with "alt") won't show me the drive.
     
  10. MisterAndrew thread starter macrumors 6502a

    MisterAndrew

    Joined:
    Sep 15, 2015
    Location:
    Portland, Oregon
    #10
    Which SSD are you trying to boot from? It has to be an AHCI, not NVMe. The SM951 and Apple proprietary version are the best for the cMP (Except the Lycom won’t accept the Apple one.)

    As an update to this thread I have mine in slot 3 and it works good. I force enabled trim for all drives and it no longer hangs on boot. That seems weird since the Apple SSD supports trim natively, but whatever the issue is it fixed it.
     
  11. psaintemarie macrumors newbie

    psaintemarie

    Joined:
    Apr 29, 2018
    Location:
    Paris, France
    #11
    Yep I just finally understood that. Going to send back the NVMe one and get a AHCI. The SM951 looks like a good option.
    As for the TRIM option, what was your way of enabling it on all your drives ?
     
  12. MisterAndrew thread starter macrumors 6502a

    MisterAndrew

    Joined:
    Sep 15, 2015
    Location:
    Portland, Oregon
    #12
    Type 'sudo trimforce enable' in Terminal. Be aware that some SM951 are NVMe and the AHCI are becoming difficult to find. If you decide to go with the Apple version, the PCIe adapter for them is cheap on eBay.
     

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