I'm not so confident that a RAID-1 will win over a single disk. When it comes to writes, the latency should be ~50 higher (if both disk must sync), since the spindles are not running synchronously. This applies to softraid, not something like a battery-backend raid controller of course. Or am I wrong here?
Software RAID-1 in Linux, can read data in all disks and generally increase a lot the data rate in reads. In writes, for sure, the overhead is great compared with a single disk, but not too much.
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