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Topic starter
I just got my 4m2 up and running with 4 x 4TB Samsung 990 Pros in a RAID 5 config. Read speed is good at 1759 MB/sec, but write is only 670. Seems quite slow to me giving the speed of the drives, and connection. Also with four drives should I be getting max throughput since each drive is using a PCIe lane? I am running an Intel Mac with Thunderbolt 3.
Posted : 24/07/2025 4:57 pm
With intel, that is what you are going to get. If write speed is your priority, use RAID 0 (and backup frequently). If you don't need all the capacity, RAID 1+0 gives you read/write speed, and redundancy.
Posted : 24/07/2025 5:57 pm
Topic starter
@softraid-support Interesting. The marketing materials on the website cite 40gbps/3000MBs as the speed an an Intel Mac. Why is the write speed so much slower?
Posted : 25/07/2025 6:54 am
Marketing always says the bus speeds. Theoretical throughput.
When we post actual "results", we use real world benchmarks (like AJA System test), with published CPU and drive configurations, on freshly created volumes. I would have to look that up for your setup, or repeat the test, to give you real world data.
But use AJA System test for testing, with these settings, so you can compare with other results:
Go to the App store and get AJA System Test Lite.
Run AJA, set resolution to 8K video, Codec to 16bitRGBA, and file size to 64GB.
Next, in settings, check "Dual DMA engine".
Select your volume to test.
See what results you get.
Its as close to a "standardized" result as you can get.
M series is faster on writes than intel, as its more efficient on CPU usage.
Posted : 26/07/2025 12:21 pm
