Thecus N7700PRO Network Storage Server

Aug 22nd, 2010 | By Anthony

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At the steeper ends of the NAS scale, JBOD and RAID 0 are seldom used. Neither of these configurations offer data redundancy, and in the event of any individual physical disk failure the entire file system is at risk. JBOD, also known as a linear volume addresses each disk in the configuration as concatenations of a single virtual disk. A JBOD setup can be thought of as inverse partitioning where instead of a single drive separated to create logical drives a JBOD configuration concatenates two or more physical drives into one logical drive. Though JBOD is not particularly used with larger number of disks, or is necessarily the best choice for a disk setup, for consistency with our testing with smaller two or three bay devices and for the sake of reference we will address it and compare it alongside with RAID 0 and RAID 5 configurations. JBOD technically isn’t a RAID volume- rather it is known as a non- standard RAID volume and by design of combining independent disks, it is especially useful for combining assortments of drives with varying volumes. Where RAID configurations combine drives at the limit of the smallest disk, JBOD does not.

Thecus N7700Pro NAS

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Thecus N7700Pro NAS

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Starting with our first set of numbers, we see that partially due to the amount of memory in our test bed, and partially due to the system’s own memory, we see an enormous cache effect. Averaging out the measured throughput rates through each record size and disregarding the results which represent the cache effect the Thecus N7700Pro managed a write throughput of 58.8 MB/s.

Thecus N7700Pro NAS

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Thecus N7700Pro NAS

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Next, the Re- Writer test measures the system’s caching ability. It is typical that Re- Writer results are significantly higher than those reported in the Writer test as the test measures reading performance of a file that was previously read which is typically reflected by the amplification of the formation in the ranges of 32MB to 512MB file sizes (in this case). However, instead for the N7700Pro, we see the increase of write throughput in the right end of the graph. In our Re- Writer we observed a much improved transfer rate of just under 90 MB/s.

Thecus N7700Pro NAS

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Thecus N7700Pro NAS

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For read performance in the JBOD configuration, the TS-559 Pro managed 72.9 MB/s.

Thecus N7700Pro NAS

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Thecus N7700Pro NAS

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With the Re- Reader test, the system showed a mild increase of performance rising to 83.6 MB/s.

Next is a favorite among overclockers, gamers and performance users: RAID 0. RAID 0 splits data across usually two and occasionally more disks. Because of this, RAID 0, like JBOD is left without data redundancy and like a JBOD configuration: any individual disk failure causes the entire system to fail. RAID 0 typically isn’t used beyond two disks (unless in its hybrid form: RAID 1+0), and especially not in the network storage environment, but it does give us a few interesting data points and is a handy comparison against the more conventional, and practical RAID 5 configuration.

Thecus N7700Pro NAS

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Thecus N7700Pro NAS

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Performance of RAID 0 in many respects is similar to JBOD. Only, of course, faster. For our Writer and Re- Writer tests, the N7700Pro hit 81.8 MB/s and 109.5 MB/s respectively.

Thecus N7700Pro NAS

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Thecus N7700Pro NAS

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With our Reader test in RAID 0, we have a very consistent just around 85 MB/s throughput rate.

Thecus N7700Pro NAS

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Thecus N7700Pro NAS

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With the Re- Reader test, we do not see any difference in performance between the Reader or Re- Reader test. The NAS averaged around 85 MB/s here as well.

Thecus N7700Pro NAS

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Thecus N7700Pro NAS

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