February 21, 20233 yr Author @WarHawk_AVG The onboard nvme drive KingSpec M.2 2242 NVMe 512GB (theoretical max speed 600 MB/s in specs) Here the PCI 2.0 lane of the OPi 5 is defenetly not helping and its a cheap e-bay drive... root@:~# dd if=/dev/nvme0n1 bs=1M count=10000 of=/dev/null 10485760000 bytes (10 GB, 9.8 GiB) copied, 50.3259 s, 208 MB/s The Samsung 850 EVO SSD over USB in the enclosure (theoretical max speed 540 MB/s in specs): root@:~# dd if=/dev/sda bs=1M count=10000 of=/dev/null 10485760000 bytes (10 GB, 9.8 GiB) copied, 27.1413 s, 386 MB/s The Software Raid in on the 6TB WD Red HDD (max theoretical should be 2x speed of WD Red) root@:~# dd if=/dev/md0 bs=1M count=10000 seek=100000 of=/dev/null 10485760000 bytes (10 GB, 9.8 GiB) copied, 53.1439 s, 197 MB/s Single WD Red HDD (theoretical max by spec 180 MB/s) root@:~# dd if=/dev/sdd bs=1M count=10000 of=/dev/null 10485760000 bytes (10 GB, 9.8 GiB) copied, 57.9577 s, 181 MB/s So in case of the Spinning hard drives the harddrive itself will be the bottleneck. In case of SSD the enclosure is the limiting factor. I am happy with it, more than Ill need for my purposes.
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