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Wi-Fi Router Charts

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Mesh System Charts

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Performance - Write

As I do with all NAS testing, I used IOzone to check out the SC's file system performance (the full testing setup and methodology are described on this page).

• SC firmware version tested was 4.12.0
• Drives used were Hitachi Deskstar 7K80 series, 80GB 7200RPM and 2MB buffer (Model HDS728080PLAT20)
• Keep in mind that the maximum raw data rate for 100Mbps Ethernet is 12500 kBytes/sec and 125000 kBytes/sec for gigabit

Figure 8 shows a 3D surface plot of the SC's write performance using file sizes from 64 kBytes to 1 GBytes and record sizes from 4 kBytes to 16 MBytes. Note that the plot is oriented so that larger file sizes are closer to the front. The peak speeds well above the Ethernet maximum are produced due to both Windows OS and NAS caching and buffering.

SC101 Write Performance

Figure 8: SC101 Write Performance
(click image to enlarge)

Due to the SC's high performance claims, I think it's fair to see how the SC stacks up against an internal IDE drive. Figure 9 shows IOzone write test results using the hard drive of the machine running IOzone as the target drive. While the hard drive's peak cached performance is significantly higher than the SC, that's not the most important part of the plot.

Another close look at Figure 8 reveals that performance falls off sharply with file sizes of 4MBytes and larger. Actually, the performance drop occurs with a 2MB file size and record sizes of 256 kB and up. This means that if you're copying large files, such as music, video or even pictures from high pixel digital cameras, you're going to be waiting awhile.

Hard drive Write Performance

Figure 9: Hard drive Write Performance
(click image to enlarge)

Figure 10 shows write performance with the SC loaded with two drives and configured with a 20GB mirrored volume.

SC101 Mirrored Write Performance

Figure 10: SC101 Mirrored Write Performance
(click image to enlarge)

The good news is that peak cached performance isn't much different with mirroring than without. But the downside is that once you get past the cached performance area, write speed falls to about half what you get without mirroring - averaging about 2.5 MBytes/sec. Actually, if you don't upgrade to at least the 1.42 firmware version, you'll get even worse mirrored performance!

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