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Software or Hardware issue causing slow SSD RAID 0 speeds?
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!!
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1 Reply
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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!
forums.tomshardware.com
[SOLVED] - RAID 0 speed slower than expected z97
Hello all, I just installed 4 Samsung EVO 840 in a RAID 0 configuration. I tested the drive's speed with CrystalDisk, and it reports 1400 MB/s. I was expecting 2000 MB/s. CrystalDiskInfo reports two drives at 100% optimal and the … Continue reading
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