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72 posts

Master Geek
+1 received by user: 10

Topic # 228832 24-Jan-2018 19:39
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Advice sought please - Mac Pro PCIe mounted Samsung AHCI SM951 Blade shows dismal write performance using Black Magic Free Speedtest… about 200 MB/s vs the read of about 1400 MB/s..


Tried allowing all the permissions on this PCIe Slot 3 mounted Samsung SM951 AHCI disc's boot OS, from different accounts, from another OS X with Yosemite 10.10.5 on it, tried SMC & PRAM resets.. removed all 6 other internal discs and the attached NAS, all the peripherals… went (right) back to a wired mouse/keyboard & 1 screen...… still can’t loosen up the permissions… pretty certain this is why I have a really really slow computer whenever some ‘writing’ is required (which is all the time)...


All Black Magic Free Speedtests show normal, thats internal SSD'd mounted in PCIe Slot 2, Internal SSDs mounted in the DVD Trays and SSD's & HDD's in the 4 Sled Trays etc.. it's just the one type of disc that I cannot get working properly, it's now the primary boot disc, with OS X High Sierra 10.13.2... it's a 256GB and runs about half used/half empty mostly...


It's the 1st time, and only time, that I have a disc I can't unlock all the permissions on, so thats my 'Guess #1'.


Pictures probably speak a thousand so...



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72 posts

Master Geek
+1 received by user: 10

  Reply # 1946301 24-Jan-2018 21:25
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It's weird how it identifies OS X High Sierra which is running in PCIe Slot 3 as 'external'... I've also booted into Yosemite, and tried to reset the permissions on the AHCI blade but Yosemite 10.10.5 Disk Utility won't recognise it fully, cos of it being on the backplane board in a PCIe slot or something, not too sure... I have no troubles with ordinary SSD's on PCIe cards, it's just this (supposedly) faster unit that is giving trouble.. (it is twice as fast as 2 x SSD's raided on a PCIe card in the machine but only reading due to the current 'write' issues).





It's in APFS file structure which I think is whats normal for this type of disc...








These other storage discs, spare OS's, backups etc... they all behave normally...












553 posts

Ultimate Geek
+1 received by user: 186

  Reply # 1946364 25-Jan-2018 06:58
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God is dead.



1541 posts

Uber Geek
+1 received by user: 535


  Reply # 1946420 25-Jan-2018 09:15
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God is dead.

Not a particularly useful comment.

If the drive is stuffed just say that.

72 posts

Master Geek
+1 received by user: 10

  Reply # 1946818 25-Jan-2018 18:48
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AUSSIE based Mac expert (DG) says 'enable trim force' in terminal... let us try that...  here's what happened after the Mac rebooted..





Lets test it now... and yip we are smokin'... GOD shows 1300-1400 MB/s of READ/WRITE speeeds using Black Magic Free Speed Test.


Thanks DG, legend man, so simple... just 3 words entered into terminal haha so so simple.


And so, GOD's perfectly ok.


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