OCZ Z-Drive R4 1.6TB PCIe 2.0 x8 SSD Full Review - 8 SF-2200's Can't Be Wrong!
Back in June of last year, OCZ released the RevoDrive, followed up rather quickly by the RevoDrive x2. A further jump was made with the introduction of VCA 2.0 architecture with the RevoDrive 3 and 3 x2. Each iteration pushed the envelope further as better implementations of VCA were introduced, using faster and greater numbers of PCIe channels, linked to faster and greater numbers of SandForce controllers.
While the line of RevoDrives was tailored more towards power users and mild server use, OCZ has taken their VCA 2.0 solution to the next level entirely, putting their sights on full blown enterprise purposing. With that, we introduce the OCZ Z-Drive R4:
We covered VCA 2.0 in greater depth in our RevoDrive 3 x2 Review, but here's a quick recap:
RevoDrives 1 and 2 used a simple SiliconImage RAID-0 solution, which scaled rather nicely at greater queue depths, something not accomplished by prior integrated SSD RAID solutions. The RevoDrive 3 improved greatly upon this with OCZ's VCA 2.0 (Virtualized Controller Architecture) SuperScale controller:
In essence, the new VCA controller acts like a supercharged traffic cop. It's able to intelligently handle multiple IO requests from the host (PC) side, and arrange them, on-the-fly, in the best possible order to be passed onto the SSD controllers. This minimizes the possibility of lag introduced by any single controller from negatively impacting the IO performance of the unit as a whole.
The Z-Drive uses a newer version of the VCA 2.0 solution. As compared with the RevoDrive 3 x2, this new chip doubles PCIe bandwidth (x8 vs. x4), as well as doubling the number of SF-2200 controllers it can handle (again, 8 vs. 4). Pulling off a full doubling of in's and out's is not an easy task. Achieving an effective scaling of this doubling is even harder. Let's see if the proof is in the pudding.
Finally, here's an OCZ-produced video explaining VCA 2.0 even further: