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  • Software or Hardware issue causing slow SSD RAID 0 speeds?

    Posted by Sam Frazier, Jr. on January 18, 2024 at 6:38 am

    I have 2 x TEAMGROUP MP34 4TB NVME drives in RAID 0 (using Apple Raid Assistant) in a SABRENT Thunderbolt 3 to Dual NVMe M.2 SSD Enclosure connected to my M1 Pro MacBook Pro using Thunderbolt 3. When I first run the speed tests & the drive is empty, it runs around 2000-2500+ MB/s read & write.

    But, it starts to get inconsistent and weird as it fills up. The other day it took 4.5 hours to transfer 1.2 TB (which would make it approximate 60% full upon completion) of data. This usually takes 40-75min when it starts empty. I’ve even run speed tests showing the read speeds around 30MB/s. I’ll erase the drives and RAID, re RAID it, the speed go back up and always start the same slowdown as I try to fill the capacity. Then again, I have records of other times where the drive was 75% full and it still ran 1000-1200 MB/s.

    So, any idea what’s happening here? It the issue the SSDs? The Enclosure? The software? Something else? Thanks for any help!!

    Hector Vera
    replied 6 months ago
    2 Members · 1 Reply
  • 1 Reply
  • Hector Vera

    January 18, 2024 at 4:57 pm

    I was looking for some answers online for this questions because its odd how SSD can be slower as it fills up. The purpose of SSD is to be a lot more faster than traditional HDDs since SSDs has no moving parts and everything should be loading a lot more quicker as a result.

    There are some benchmark issues related to RAID 0 + SSD being slower than expected and you may want to take a look at this link to see if it helps you understand better on whats really going on: https://forums.tomshardware.com/threads/raid-0-speed-slower-than-expected-z97.3698866/#post-22288950

    Hope it some ways, it helps! Good luck!

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