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Another mind:
ReplyDelete"So, what’s a lowly Systems Engineer to do when the iowait time starts to pile up? Well, it turns out that those IOPs are initially bound by the disk on the backend and not local NIC traffic, so you can use Linux Software RAID to significantly improve the I/O capacity of your disk (but not the latency or variability…more on this later). For a performance boost, there is a lot of bad advice on the Internet saying you should RAID 0 your disk (because “it’s redundant on the back end”), but to the the discriminating SysEng, that should scream bad idea."
from: http://blog.9minutesnooze.com/raid-10-ebs-data/