OWC Mercury Professional U.2 Twin Thunderbolt 3 enclosure assessment: Huge capability, flexible, speedy in the proper configuration
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At a look
Skilled’s Score
Execs
- Leverages two (U.2) to 8 (M.2) NVMe SSDs discretely or in RAID
- Rapid with the proper SSDs and setup
- Simple to improve
- A couple of drives in a single enclosure reduces cable litter
- Superbly flexible
Cons
- Tool RAID makes use of CPU cycles
- Calls for an non-compulsory 2d, $150 caddy to care for greater than 4 M.2 drives.
- SoftRAID motive force rendered our Home windows check mattress unbootable
- macOS problems after SoftRAID motive force removing
Our Verdict
This strong two-bay enclosure is solidly built, speedy, simply upgraded, and flexible–permitting you to configure interior drives any means you need by means of the integrated device. An effective way to scale back cable litter when using more than one exterior SSDs.
The $300 Mercury Professional U.2 Twin is a Thunderbolt 3 garage field that includes two U.2 (a server/enterprise-level NVMe connector) bays. So as to add as much as the 8 M.2 SSDs touted by way of OWC, you must use a four-slot OWC Shuttle U.2 to M.2 caddy/adapter integrated within the field, after which purchase any other adapter ($150) to max out at 8 SSDs and 64GB. Or you'll be able to purchase it pre-populated from OWC.
For 8 drives (quickest) pricing begins at $1,500 for 4TB, and ends at a whopping $12,799 for 64TB. Yup, 8GB SSDs are dear. Word that operating reflected RAID 1 or reflected/striped RAID 1+0 will halve to be had capability.
Regardless, the naked field means that you can improve at your recreational and wish, and the integrated SoftRAID XT device means that you can create RAID 0/1/1+0 arrays with any mixture of drives. The SSDs can also be accessed as separate entities, i.e., discrete drives.
The black steel field that's the U.2 Twin measures round 9.25 inches lengthy, 5.75 inches tall (together with rubber toes), and three.35 inches broad. The entrance is composed of porous grills to facilitate airflow in the course of the two bays, with a cast strip of steel up the center that comprises the backlit brand and two task lighting fixtures.
The again is house to 2 Thunderbolt 3 ports (Sort-C, one for daisy-chaining), a Kensington lock port, the 12-volt DC jack, and the opening grill for the fan. To get admission to the interior U.2 bays, you merely take away the 2 Philips screws from the panel, most sensible and backside heart. The 2 WD 960GB 2.5-inch U.2 drives that OWC integrated in our check unit have been secured by way of a unmarried screw, although there are 4 holes for three.5-inch drives and the caddies.
The Commute caddies are pricey however solidly constructed and as discussed, function 4 M.2 slots. The detachable most sensible of a Commute serves as a beefy warmth sink that’s secured by means of 4 screws. There’s a pleasant slab of thermal touch subject matter at the inside the warmth sink, so that you’ll most probably need to press down somewhat onerous directly to align the holes for the screws.
Word that the caddies comprises a PCIe transfer. Some PCs with restricted PCIe sources (lanes) won't have the ability to accommodate them. Each iMacs (2015/i7 and M1), in addition to the older a Core i7-5820K/Asus X99 Deluxe (circa 2015) testbed treated them simply high quality.
The Mercury Professional U.2 Twin is warrantied for a unmarried yr and any drives integrated within the populated variations for 3 years.
Efficiency
On our M1 iMac operating macOS Large Sur, the Mercury Professional U.2 Twin’s efficiency various considerably relying on what drives have been put in. With the 2 960GB WD Ultrastar DC SN630 U.2 SSDs OWC bundled, sustained switch charges, as proven under, approached 2TB consistent with 2d in each instructions. This used to be the usage of Apple RAID.
With a unmarried M.2 NVMe SSD, this dropped to round 1300MBps in both course. Any some of the M.2 NVMe SSDs we used is able to saturating the Thunderbolt 3 bus to the purpose of just about 3GBps transfers, given a quick sufficient enclosure. I’m guessing there’s a penalty imposed by way of the PCIe transfer at the caddies. Nonetheless, this promised excellent issues ins next checks, then again…
Apple RAID (device) with two M.2 NVMe drives within the caddies (striped/RAID 0), slowed considerably to 636MBps writing and 735MBps writing. Ahem. Don’t use Apple RAID with M.2 drives on this field except you don’t care such a lot about velocity.
OWC’s SoftRAID with two M.2 NVMe drives used to be a ways quicker than Apple RAID writing, although studying nonetheless lagged smartly at the back of what a unmarried pressure delivered. Word that SoftRAID calls for a kernel extension and your permission within the Apple safety startup software to put in it.
It used to be simplest after I reached 4 drives in RAID 0 that the unit crowned 2GBps. Now not as speedy as was hoping, however masses speedy sufficient. Expanding to seven drives simplest bumped up the write velocity to two.2GBps so we unnoticed that display screen cap. OWC equipped a 2d U.2 Commute (caddy/service/go back and forth) so I may just check with the total 8 M.2 NVMe SSDs.
Whilst the switch speeds weren’t all that I’d was hoping for, the U.2 twin remains to be simply speedy sufficient for its supposed function. I additionally attempted the usage of person drives besides to change running techniques, any other at hand (very, in my case) use for the U.2 Twin and Commute caddies.
SoftRAID means that you can mix the SSDs throughout the U.2 Twin any means you want, which, as famous, makes it outstandingly flexible. Then again, I did run into some problems.
After uninstalling the SoftRAID motive force from the M1 iMac check mattress, no longer the entire 8 drives throughout the U.2 Twin have been enumerated in Disk Application, or for that topic, on another laptop. Moreover, seeking to initialize, erase or create an Apple RAID array with the drives that remained visual after the driving force removing both hung Disk Application or failed.
Unfortunately, I by no means discovered the motive, however it’s a post-facto deal and shouldn’t have an effect on many customers. Erasing the SSDs personally the usage of an OWC Envoy Categorical on PCWorld’s check mattress cured the problem.
Alas, putting in SoftRAID at the PCWorld Home windows check mattress promptly rendered it unbootable. Fortunately, it created a repair level so the gadget used to be recoverable the usage of Home windows boot media. Then again, this little snafu assists in keeping me from recommending SoftRAID with Home windows presently. It additionally curtailed checking out on that platform for comparability functions.
To supply no less than a modicum of context, the quickest sustained switch charges we’ve observed out of an exterior Thunderbolt 3 pressure are round 2.8GBps studying, and a pair of.25GBps writing.
Know additionally that device RAID makes use of your laptop’s CPU. This will and can have an effect on garage efficiency if the CPU is tapped out doing different duties. Fortuitously, in my checking out with video transcoding and several other different real-time track programs operating, the drop used to be simplest about 100MBps (from round 1.3GBps to at least one.2GBps on an Intel iMac) with the 2 U.2 SSDs put in. I imagine that insignificant, however will have to you come upon a extra critical drop in efficiency, by way of all manner, let me know.
Final analysis
Given Apple’s pricey and capability restricted interior garage, it’s great to have a quick, robust, simply upgradeable exterior answer such because the Mercury Professional U.2 Twin. It’s a superbly flexible and handy means so as to add more than one discrete or RAID volumes with no ton of cable litter.
As to the SoftRAID problems, OWC is constantly bettering the product (model 3 of the paid device used to be simply launched), so I be expecting the insects I encountered to vanish in due time.
Jon is a Juilliard-trained musician, former x86/6800 programmer, and long-time (past due 70s) laptop fanatic residing within the San Francisco bay space. jjacobi@pcworld.com
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