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We tested our ASUSTOR AS-604T with Intel NASPT in which we improved the HD video templates by increasing the size of the files to 8 GB. We also removed the File Copy to/from NAS test and added templates of random reading and writing of files with a total size of 8 GB. We installed Seagate Barracuda ST1000DM003 HDDs into the NAS. Besides creating a disk volume, a shared folder and a user account, we didn’t change any settings with the exception of enabling Jumbo Frames with a frame size of 9K. We did not enable any extra modules or services on the NAS. The latter was connected directly to an Intel Core i5 desktop running Windows 7 x64.

The first diagram shows the performance of the NAS with JBOD, RAID0, RAID5 and RAID6 arrays inside.

These numbers are normal for a modern x86-based NAS. The peak speeds are over 100 MB/s, limited by the Ethernet interface. It is quite possible to achieve higher speeds by means of special network switches.

Using fault-tolerant arrays doesn’t produce a performance hit, which indicates that the NAS’s processor is fast enough to cope with the increased load. The software implementation of the striped array may not provide any performance benefits as we can see in the diagram but we’ve only seen this with x86 devices and this behavior may be peculiar to this hardware platform. The random write results are affected by caching, so our templates still need some more polishing off.

External disks can be connected to the ASUSTOR AS-604T via USB 3.0 and eSATA to expand the overall storage capacity. The next diagram shows the performance of an external eSATA disk with EXT4, HFS+ and NTFS file systems (formatted by the NAS itself).

It is unusual that the data-transfer speed doesn’t depend much on the file system type but the overall level of performance is comparable to the internal HDDs. The external interface doesn’t provoke any performance hit.

It’s more sophisticated with USB 3.0 because data travels through two additional chips: the NAS’s additional USB 3.0 controller and the external disk’s bridge.

That’s why there is a small performance hit with large files when you use HFS+ or NTFS. EXT4 is less susceptible. Anyway, you can expect peak data-transfer speeds up to 100 MB/s.

All in all, the ASUSTOR AS-604T is good in terms of speed. It has the fastest NAS platform available on the market in its product class and features efficient implementation of all data-transfer protocols. That’s why it is fast even if you combine its HDDs into a fault-tolerant array.

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