Disk Performance

Recently got a Synology DS1819+ and did some performance benchmarks.

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.

Group Consensus

Learned from Ted Talk How can groups make good decisions? that if asked to come up with estimates, individuals on average do worse than smaller groups of 5 (estimate on height of Eiffel tower).  In moral issues small groups tended to cancel out (suppress?) more extreme views.  Presenters didn't advocate but implied that this might help out in voting situations to mediate extremism.