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Testing-more

Results for the iozone benchmarks are shown in Figures 4 - 7.

RAID 0 Throughput comparison - write
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Figure 4: RAID 0 Throughput comparison - write

RAID 0 writes are very similar at the 1 GB and higher file sizes while RAID 0 reads are similar across all file sizes shown.

RAID 0 Throughput comparison - read
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Figure 5: RAID 0 Throughput comparison - read

Performance tracks pretty well at smaller and largest file sizes, but with a bit more spread at the largest file sizes.

RAID 1 Throughput comparison - write
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Figure 6: RAID 1 Throughput comparison - write

Read performance is again pretty similar, except for the Samsung drive at the 1 GB and higher file sizes.

RAID 1 Throughput comparison - read
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Figure 7: RAID 1 Throughput comparison - read

My take-away from the iozone tests is that the performance with the 2.5" drive is more similar than different from that with the 3.5" drives installed.

Conclusion

So I learned that it was just my ignorance about today's higher-performance 2.5" SATA drives that was making me think that using them (or at least drives performing equal to or better than the WD Scoripo Black) would sacrifice performance.

But I wasn't surprised that using 2.5" drives would yield lower power consumption. But Table 1 shows a 40% reduction from the 35W drawn by two Seagate 7200.11s to the 20W consumed by the pair of WD Scorpio Blacks!

Test Description WD
Scorpio Black
(2.5")
Seagate
Barracuda
7200.11
(3.5")
Samsung
Spinpoint F1
(3.5")
Active (W) 20 35 32
Drives spun down (W) 18 20 20
Table 1: Power Consumption

The final benefit from using the 2.5" drives is their virtually silent operation! They were so quiet, that I had to rely on the TS-239 Pro's front panel lights to know whether they were spun down or up.

The only disadvantage that I can see from using a 2.5" NAS is that you won't get as much storage for your buck and total capacity will be lower. The largest 7200 RPM 2.5" SATA drive as I write this is the 500 GB Seagate Momentus 7200.4 (ST9500420AS), while the largest 3.5" SATAs are 2 TB.

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