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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.

Write Performance benchmark summary

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.

Read Performance Benchmark summary

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.

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