External USB 3 hard drives are pretty common these days and GNC has reviewed several models in the past. However, this is the first portable RAID unit that I’ve had on my desk. On show here is the G-Technology G-RAID mini and with a pair of 2.5″ drives, the G-RAID mini offers a choice of RAID 0 or RAID 1 in a very attractive silvery metal case. Let’s take a look.
The G-RAID mini comes in the usual blue and white G-Technology packaging and in the box is the unit itself, a power supply, a travel case, a Firewire 400-to-800 cable, a Firewire 800 cable and a USB3 cable. The travel case isn’t anything to write home about but it’s good to have the full range of cables. The G-RAID mini weighs in at just under a 1 kg so it’s pretty hefty but this an all metal case – there’s no cheap plastic here. It’s also surprisingly small at only 149 x 83 x 38 mm, as you’ll see from the ruler below. Overall, it’s a solid, well-built unit.
Looking over the unit, round the back are a USB 3 port, two Firewire 800 ports and the DC in jack. On the underside, there’s a cooling fan and on the front, there’s white LED in the G-Technology logo, which flashes with disk access. There’s a hidden “drive failure” LED which goes red if a drive dies, but you’ll see the LED flicker when the mini powers up. The G-RAID mini needs supplementary power from the PSU when connected up via USB, but it’s not need when the Firewire ports are used.
The G-RAID mini can be configured either as RAID 0 with both drives contributing to one large logical volume or else as RAID 1 with the drives mirroring each other. There’s a simple configuration tool that let’s you chose which it’s going to be. Changing the RAID level completely erases the drive so it’s best to decide early what configuration you want.
The utility is available for Windows and Mac, but once the G-RAID mini is setup, it works as any device that understands USB storage, e.g. Linux boxes or Chromebooks.
So that’s the basics out the way. What’s the performance like? I ran through my usual selection of tests with hdparm, dd and bonnie++ in both RAID 0 and RAID 1 configurations. Remember, while these tests are indicative of performance, they are for my setup only.
|RAID 0||USB 3||USB 2||FW 400|
|hdparm (read)||155 MB/s||33 MB/s||39 MB/s|
|dd (write)||178 MB/s||37 MB/s||22 MB/s|
|bonnie++ (write)||173 MB/s||37 MB/s||21 MB/s|
|bonnie++ (read)||171 MB/s||49 MB/s||55 MB/s|
|RAID 1||USB 3||USB 2||FW 400|
|hdparm (read)||126 MB/s||32 MB/s||39 MB/s|
|dd (write)||117 MB/s||38 MB/s||21 MB/s|
|bonnie++ (write)||114 MB/s||37 MB/s||21 MB/s|
|bonnie++ (read)||154 MB/s||51 MB/s||53 MB/s|
In either configuration, the G-RAID mini is fast, especially when connected up via USB 3 in RAID 0. Looking at the data, it’s clear that at USB2 and Firewire 400 speeds, there’s no performance difference between RAID 0 and RAID 1. Simplistically the data connection rate is the limiting factor.
However, with USB3 bonnie shows that write speeds fall by a third in the RAID 1 configuration, with reading affected by only a 10% fall. This is not unexpected as extra work is required to write the data in a mirror setup. Regardless, it’s still 3 times faster than USB2.
In summary, the G-RAID mini is an ideal companion for power users with the latest ultrabooks or MacBook Pros where performance is matched to good looks. It’s not cheap with an on-line price of around £275 for the 2 TB version but the protection against single drive failure will be important to those with high profile or travelling roles where having the data available is crucial. The G-RAID mini is an attractive and well-built unit with great performance and it will appeal to both those who need either high-performance or protection against drive failure.