QNAP TS-459U-RP Turbo NAS Reviewhardnrg - July 22, 2010
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SiSoft Sandra is a diagnostic utility and synthetic benchmarking program. Sandra allows you to view your hardware at a higher level to be more helpful.
Higher is better
In each of these RAID configurations, all four drives are being used. While JBOD is not strictly true RAID, it does serve a purpose to give you an idea of the performance of the NAS when all four drives are configured as a single disk volume without striping. I was quite amazed to see an Atom-powered NAS achieve a rate of nearly 61 MB/s, as I wasn't expecting such high performance from a low-powered unit. RAID-0 naturally held the crown in this test, achieving a rate of 67 MB/s. I was actually more surprised to see that running the NAS in RAID-5 and RAID-6 modes did not hurt performance that much, just 18-19% lower than the performance of RAID-0, and ~5-7 MB/s lower than JBOD. I really think that with the current capacities of hard drives at 1.5 TB+, most users would choose the safety of RAID 5 or 6 to have added peace of mind, rather than opting for the highest performance in RAID-0, or highest capacity in JBOD.
Lower is better
The access time results had me scratching my head for a while, and I reran the tests several times to make sure there were no anomalies. The first peculiarity was that RAID-0 had a 20% higher latency, at 19.6 ms, than JBOD, which is still fairly respectable. But then RAID-5 achieved the best access time at just 15 ms, with RAID-6 trailing just behind. I think this is the most significant aspect of this test, that the TS-459U-RP has better access time performance in either RAID 5 or 6 modes, than when running in RAID-0 configuration.