Looked around at a bunch of perf benchmark tools and settled on CrystalDiskMark 6.0.1 (although I downloaded and installed from the Microsoft Store - quick/easy install (free)).
Ran on the old Synology DS215J and on the new Synology DS1819+
Results from a CIFS mount of a folder.
DS215J:
DS1819+:
OK, so way better caching on the random reads and writes. The sequential is about 30% better.
Disks behind the test are:
DS215J - 2 WD30EFRX-68EUZN0 - 3TB 5400RPM WD Red disks
DS1819+ - 2 WD40EFRX-68N32N0 - 4TB 5400RPM WD Red disks
Interesting to note the WD30EFRX has 147MB/s interface speeds, the WD40EFRX has 150MB. The 2GB model WD20EFAX has 180MB/s interface speed and 256MB cache whereas the other models have 64GB cache. Strange difference, 2GB model seems to be much better.
There are no real specs of I/O perf of these models but the assumption is newer ones have higher areal density so better (faster) I/O.
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