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8x 5400 RPM disks will generally outperform 4x 7200 RPM disks, save for single-threaded sequential read/write. As your use case (virtual machines) is rich of small random reads/writes, you should prefer the solution with more spindles (ie: the more the disks, the better). Anyway, considered how cheap are 7200 RPM disks, I strongly suggest to use 8x such ...

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