[Gllug] Large raid 5/5+0 setup

[Nix]

On 18 Jun 2009, John Hearns told this:
> nilfs http://www.linux-mag.com/cache/7345/1.html

I'd be frankly astonished if the long-term performance of this on
rotating storage were anything but abysmal. Log-structured filesystems
were all the rage for a while in the 1990s but they foundered on this.

They're a great idea, but only if fragmentation is irrelevant. So
they're great for SSDs and awful for magnetic disks.
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