We tested the NAS with Western Digital Caviar Black WD5001AALS drives in Intel NASPT 1.7.1. We left the NAS’s settings at their defaults except that we enabled Jumbo Frames. We also created a disk volume of the required configuration with EXT4 file system, a shared folder and a user account with full access rights for that folder.
The first diagram shows the performance of the NAS with standard disk arrays created on it: one drive, two drives in RAID1 and four drives in RAID0, 5 and 6.
Like many other NASes based on the Intel Atom processor, the QNAP TS-469 Pro can make full use of a Gigabit Ethernet connection when doing sequential operations on most RAID configurations. It is only with a single drive and when writing to the RAID1 that its performance is somewhat lower. The rest of the configurations can process large files with a speed of 100 MB/s and higher. The high-performance hardware platform is efficient with RAID5 and RAID6, so these arrays are almost as fast as the striped RAID0.
The second diagram shows the performance of the NAS with iSCSI. The LUNs were created on existing disk arrays of different types.
The numbers suggest that iSCSI doesn’t differ much from standard disk arrays in performance. It is just somewhat faster at reading and slower at writing, which means that the TS-469 Pro will be a perfect choice for virtual servers. By the way, it sports VMware and Citrix certificates and is compatible with Microsoft Hyper-V.
The first two diagrams are indicative of some performance reserve which may be used to process encrypted disk volumes. We checked out encrypted RAID0 and RAID5 arrays built out of four hard drives.
This test suggests that encryption is a rather heavy load for the NAS’s processor. The speed of processing large files on encrypted partitions is only one third the normal speed. The maximum is 30-40 MB/s.
The NAS supports high-speed interfaces USB 3.0 and eSATA for external disks. We checked out the speed of accessing external disks via network. The following diagram is about USB 3.0:
The data-transfer speed is high with this interface. You can get over 50 MB/s even with NTFS. With EXT4, the external disk is almost as fast as the internal ones. Take note of the high HFS+ performance, too.
The eSATA interface is also fast as shown in the final diagram:
So, the NAS’s I/O interfaces let you use external disks with minimum performance loss.