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Performance

As noted above, I tested with 3.4.3 Build 0520T firmware using our standard NAS test process to run tests with RAID 0 and 5 volumes using all five drives. Since RAID 10 requires an even number of drives, those tests were configured using only four drives.

The Benchmark summary below shows Windows File copy write with a RAID 0 array measured 100 MB/s, 96 MB/s for RAID 5 and 99 MB/s for RAID 10. File copy read for RAID 0 was slightly higher at 102 MB/s and RAID 5 at 99 MB/s, but much lower for RAID 10 at 71 MB/s. Remember the published results are the average of three test runs, so the log RAID 10 results are not an anomaly.

QNAP TS-559 Pro II benchmark summary

NASPT File Copy write benchmarks were all significantly higher for RAID 0, 5 and 10 at 127 MB/s, 120 MB/s and 125 MB/s respectively. NASPT File Copy reads came in lower in all cases at 82 MB/s, 80 MB/s and 64 MB/s for RAID 0, 5 and 10, respectively.

As usual, the tougher NASPT Directory Copy tests couldn't break out of the mid teens.

I ran three sets of attached backup tests using I ran backup tests using a Buffalo DriveStation Axis USB 3.0 drive for the USB 2 and USB 3 tests and our standard Iomega Ultramax Pro for the eSATA tests.

I clocked the Axis' write throughput at 81 MB/s for NTFS format and 87 MB/s for FAT. I didn't test USB 2 throughput because the drive is obviously fast enough to keep up with the 25 to 27 MB/s results that I usually see for best-case NAS USB 2 backup.

Fastest results of 69 MB/s were with eSATA and FAT format. USB 3 / FAT was a bit slower at 62 MB/s. eSATA and USB 3 backup speeds matched up pretty well using NTFS and EXT3 formats.

Rsync network backup speed was a relatively poky 40 MB/s to the NAS testbed running Delta Copy.

iSCSI write and read to a 10 GB volume created on a RAID 5 array produced 85 MB/s and 67 MB/s, respectively. This put the 559 Pro II in the race among five drive NASes. But it still could not take the top spot away from Synology's DS1010+.

The RAID 5 File Copy Write and Read charts below are filtered to show only five-bay NASes. The only other five bay D525 Atom NAS I've tested is the Thecus N5200XXX. But it didn't hold the top spot in this chart for long.

QNAP TS-559 Pro II RAID 5 filecopy write - 5 bay products

RAID 5 File Copy Write Comparison - five bay products

RAID 5 filecopy read is a similar story for five-bay NASes. But the Synology DS1010+ finally relinquished the top spot among 5 bay machines.

QNAP TS-559 Pro II RAID 5 filecopy read - 5 bay products

RAID 5 File Copy Read Comparison - five bay products

Conclusion

QNAP packs its NASes with both performance and features. And as the price vs. performance chart below shows, doesn't mind charging top dollar for them. The 559 Pro II currently has a lowest price of $1140, while the older 559 Pro and Pro + are close behind at $1048.

QNAP TS-559 Pro II RAID 5 filecopy read - 5 bay products

It seems like QNAP is making it easy for buyers to justify an extra $100 or so to add a pair of USB 3.0 ports. But if you can do without the ports and get a deal on a D510 based 559 Pro or D525 based Pro+, I'd take it. Any way you go, you'll be a five-bay NAS that's among the best you can buy today.

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