PCPer File Copy Test
Our custom PCPer-FC test does some fairly simple file creation and copy routines in order to test the storage system for speed. The script creates a set of files of varying sizes, times the creation process, then copies the same files to another partition on the same hard drive and times the copy process as well. There are four file patterns that we used to try and find any strong or weak points in the hardware: 10 files @ 1000 MB each, 100 files @ 100 MB each, 500 files @ 10 MB each and 1000 files at 1 MB each.
I've restructured these charts to group by test as opposed to by SSD. It should make readability and comparisons a bit easier. Feedback is welcome here.
Our first test is perhaps one of the best to demonstrate the write speed differences between Samsung's VNAND and competing solutions. The M550 uses 64 Gbit 2D NAND, which fares well, but does slow down a bit at the 128GB capacity. The ADATA SP610 uses 128 Gbit 2D NAND, and despite controller differences, we can see the beginnings of a slow down at 256GB and a very noticable slow down at 128GB. It should be noted that while we did not include MX100 data here, it will behave similar to the SP610 when it comes to write speed vs. capacity.
File copies reflect the same write speed hurdles of the competing units, along with an interesting data point in that the 1TB 850 Pro sees a bit of a slow down at this capacity. Other controllers did not see this dip when going from 512GB to 1TB, so we can only attribute this to possible added addressing or fanout overhead with the MEX controller at this capacity (and connected to so many dies).