The test system used in this review was an HP 8200 Elite. The computer came equipped with an Intel Core i5-2400 CPU, 4GB of DDR3 1333MHz memory, Seagate Barracuda 7200.12 ST3250312AS 250GB SATA 6 Gb/s hard drive, NVIDIA Quadro FX580 512MB PCIe graphics card and an Intel 82579-LM gigabit network card. For the operating system, I installed a fresh copy of Windows 7 Enterprise.
To test the performance of the WD My Cloud Mirror, I ran a series of benchmarks using CrystalDiskMark 3.0, ATTO Disk Benchmark 2.46, Iometer and the Intel NAS Performance Toolkit. The tests were first run with the included WD Red hard drives configured as RAID 0 and RAID 1 volumes and then again with them as two individual volumes using JBOD. The My Cloud Mirror was connected to the computer using CAT6 ethernet cables and a gigabit Netgear switch.
CrystalDiskMark 3.0:
First, I ran a few quick tests using CrystalDiskMark. This benchmark tool measures the performance of a storage device by testing its sequential read and write speeds as well as its random read and write speeds using blocks 4KB and 512KB in size.
 RAID 0 |
 RAID 1 |
 JBOD |
WD doesn't really say what kind of speeds the My Cloud Mirror is capable of. Using CrystalDiskMark we can see that the NAS is able to read at speeds as high as 91 MB/s and write at more than 66 MB/s.
ATTO Disk Benchmark 2.46:
I also used ATTO Disk Benchmark to test the My Cloud Mirror's sequential read and write speeds. The tests are run using blocks ranging in size from 0.5KB to 8192KB and the total length set to 32MB and 256MB.
 RAID 0 |
 RAID 1 |
 JBOD |
The My Cloud Mirror performed better when tested with ATTO. With the two hard drives in a RAID 1 array, the unit topped out at 106 MB/s when reading and 76 MB/s when writing.
Iometer:
Next, I ran a series of tests using Iometer. This tool can be configured to benchmark a number of things. In this case, I used it to measure the My Cloud Mirror's sequential read and write speeds using blocks ranging from 512B to 2MB in size.
The My Cloud Mirror performed very well when tested with Iometer. When configured for RAID 1, the NAS was able to read at speeds as high as 107 MB/s and write at more than 68 MB/s.
Intel NAS Performance Toolkit:
The Intel NAS Performance Toolkit (Intel NASPT) is a file system exerciser and analysis tool designed to enable performance comparisons between network attached storage (NAS) devices. Intel NASPT focuses on user level performance using real world workload traces gathered from typical digital home applications: HD video playback and record, data backup and restore utilities, office productivity applications, video rendering/content creation and more.
 RAID 0 |
 RAID 1 |
 JBOD |
The My Cloud Mirror reached some respectable speeds when streaming HD video and copying large files to and from the server. Unfortunately, its transfer rates dropped considerably when creating content and copying directories full of small files to the NAS.
