I used IOzone to check out the file system performance on the Pro (the full testing setup and methodology are described on this page). Thecus supplied the Pro with five 160 GB Western Digital Caviar Blue hard drives (WD1600AAJS-08PSA, 3 Gb/s, 8 MB Cache, 7200 RPM). My test unit had the latest 2.00.10 firmware and I used default RAID settings, which included a 64 KB stripe size.
I didn't test the RAID6 performance, because the NAS Charts don't support that mode. But I did run tests with the Pro configured in JBOD, RAID 5 and RAID 10, with 100 Mbps, 1000 Mbps and 1000 Mbps w/ 4K jumbo frame LAN connection.
Figures 9 shows a summary of the Pro's large filesize write test results with 100 and 1000 Mbps LAN connections. While there is an expected difference between 100 and 1000 Mbps, there isn't much among each speed group.
Figure 9: N5200 Pro write benchmark comparison - 100 and 1000 Mbps LAN
Figure 10 shows write results with 1000 Mbps and 1000 Mbps w/ 4k jumbo frame LAN connections. What is surprising here is how little jumbo frames help performance.
Figure 10: N5200 Pro write benchmark comparison - 1000 Mbps and 1000 Mbps w/ 4k jumbo frame LAN
Figures 11 and 12 are the read counterparts to Figures 9 and 10.
Figure 11: N5200 Pro read benchmark comparison - 100 and 1000 Mbps LAN
The read plots show a bit more spread among the gigabit and gigabit jumbo frame results.