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Performance

We benchmarked our Thecus N4800 using Western Digital Caviar Black WD5001AALS hard disk drives (500 GB, 7200 RPM, 32 MB buffer, SATA II) and Intel NASPT. We connected it to our local network via a Gigabit Ethernet router with Jumbo Frames turned on. The RAIDs were built with the default settings: 64KB blocks, EXT4.

The first diagram shows you the performance of the NAS with different RAID configurations.

We can see that there’s almost no difference in performance between the different types of RAID, which means that the hardware platform can cope with higher loads. The peak read speed is about 90 MB/s whereas writing is affected by the client OS’s caching. The results are quite normal for a modern high-speed SOHO/SMB device.

When testing the N2800 model, we had odd results with external disks. That was probably a problem of the specific sample of the NAS. The N4800 allows us to check this out. First goes USB 2.0.

External disks with USB 2.0 interface can get as fast as 35 MB/s. EXT4 is expectedly the best file system in terms of performance. EXT3 is slower at reading and NTFS, at writing.

USB 3.0 is faster: up to 80 MB/s with EXT4, which is comparable to the read speed of the internal HDD. The other file systems are much slower than with the previous USB version.

The last diagram is about eSATA. This interface is slower with EXT3 than USB 3.0 but eSATA disks with EXT4 are faster than USB 3.0 disks with EXT4. With NTFS, the two interfaces are comparable in performance.

Thus, the N4800 is quite fast with external disks. Its USB 3.0 interface is most appropriate as it supports on-the-fly connection and disconnection of disks and allows running more devices concurrently than eSATA.

 
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