Performance - Backup
I put the Tera III running 1.00 version firmware through our new test process. Tests were run with 1000 Mbps and 1000 Mbps with 4k jumbo LAN connections. I ran some tests with 100 Mbps LAN connections, but not all, since it was obvious that the Tera III's performance is limited by a 100 Mbps LAN connection. In the future, I will run tests with a 100 Mbps LAN connection only for products with sub 12.5 MB/s performance.
I first checked backup performance to an Iomega UltraMax Pro Desktop Hard Drive configured in RAID 0 attached to one of the III's USB 2.0 ports. The test copies the 4.35 GB ripped DVD test folder that I use in the NAS Chart Vista SP1 file copy tests from the NAS to the attached drive. Since I also still had the Pro XHL, I was able to run a NAS-to-NAS backup test. The results are summarized in Table 1.
|Product||Backup Throughput (MBytes/s)|
|USB - FAT32||9.68|
|USB - EXT3||8.30|
|USB - XFS||8.79|
(Linkstation Pro XHL)
Table 1: Backup throughput test summary
Clearly, the Tera III's backup performance isn't anything to write home about. The good news is that it's about twice as fast as the 5 MB/s I measured for the Seagate BlackArmor for a FAT32-formatted USB backup. But it's about 40% slower than the Synology DS508.
I don't have anything to compare the almost 17 MB/s NAS-to-NAS backup speed against, since the Tera III is the first product that I have measured for NAS-to-NAS backup. But given that the Pro XHL backup target's Gigabit-connected average write performance is just shy of 40 MB/s, it's unlikely that it is the limiting factor.
Performance - Write / Read
Figure 6 presents a summary of the benchmark tests run for the Tera III, with only the 1000 Mbps LAN RAID 0, 5 and 10 results plotted. Although write cache effects are in play at smaller file sizes, you don't see the extreme cached performance exhibited by other products.
Figure 6: Write Performance Benchmark summary
Write performance with a 1000 Mbps LAN connection averaged over the 32 MB to 4 GB file sizes and with cached results above 125 MB/s removed from the average comes in at 55.1, 46.6 and 44.5 MB/s for RAID 0, 5 and 10 configurations, respectively.
Read speeds (Figure 7) for the same conditions averaged 57.3, 53.3 and 58.0 MB/s.
Figure 7: Read Performance Benchmark summary
As usual with our new test platform, 4K jumbo frames don't provide any significant difference in performance.
The Tera III holds its own against other current-generation NASes in Vista SP1 filecopy testing, measuring 32.4 MB/s, 24.0 and 31.4 MB/s for RAID 0, 5 and 10 write and 59.5, 55.1 and 55.9 MB/s for read.