I'm wondering: how well does md currently make use of the fact there are multiple devices in the different (non-parity) RAID levels for optimising reading and writing?
For example, are *writes* to a 2 device RAID-0 approaching twice as fast as to a single device? If not, are they any faster at all? Are reads from a 2 device RAID-1 twice as fast as from a single device? If there are benefits, how quickly do they degrade to nothing as disks are added? What does the picture look like for reads and writes to a 4 device RAID-10? Sorry if my subject line isn't clear, but I coudn't think of a better way to put it. Thanks, Andy
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