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Performance - NAS Charts

Updated 2/7/2009:
Note: When retested with a faster testbed, performance significantly increased.

When I tested the QNAP TS-509 Pro, I didn't realize that it was bumping up against the limits of my aging, soon-to-be-replaced iozone test machine. But early reports of the Pro's high performance over in the Forums and NETGEAR's test results indicated that the Pro, like the TS-509 Pro, would be limited by the current NAS Chart test bed.

Updated 11/21/2008: Explanatory note added

So I'll first present the results posted in the NAS Charts, then results taken with the faster iozone test machine I have been using in the Fast NAS series. Please also note that the NAS Chart tests were run with the RNDP6350-100NAS model in its three-drive factory configuration.

Figures 6 and 7 show NAS Chart combined write and read benchmarks for RAID 0 and 5 with both 1000 Mbps and 1000 Mbps plus 4k jumbo frame connections.

Write Benchmarks - 1000 Mbps LAN

Figure 6: Write Benchmarks - 1000 Mbps LAN

The main points here are that RAID 5 knocks down write throughput (around 25% for average throughput of 32 MB to 1 GB filesizes) and that jumbo frames don't provide a throughput boost. NETGEAR confirmed this, saying their testing with IOMeter didn't show a difference with 9k jumbo frames until they used 1024 KB record sizes.

Read Benchmarks - 1000 Mbps LAN

Figure 7: Read Benchmarks - 1000 Mbps LAN

For a competitive look, I ran a plot of the Pro and the 5-drive QNAP TS-509 Pro, Synology DS508 and Thecus N5200 Pro. Note that the Pro was configured with the three Seagate ST3500320NS Barracuda ES.2 500 GB drives that came installed in the RNDP6350 model tested, while the other products were configured with 5 drives each.

Competitive RAID 5 write comparison - 1000 Mbps

Figure 8: Competitive RAID 5 write comparison - 1000 Mbps

Even though the old 2.4 GHz P4 iozone test machine is limiting performance, it is limiting it equally for all products. That said, Figure 8 shows that the QNAP TS-509 Pro beats out the Pro, Thecus and Synology NASes for RAID 5 writes, mainly by maintaining higher throughput as file sizes increase.

Figure 9 shows a similar story for RAID 5 reads, but with the TS-509 Pro beating the other three products at all large file size test points.

Competitive RAID 5 read comparison - 1000 Mbps

Figure 9: Competitive RAID 5 read comparison - 1000 Mbps

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