My understanding is that raid1 doubles the writes,but can speed up the reads a lot.
How large is your database and how fast can you make backups of it?
I also thought RAID0 (striping only) made it MORE likely you could have a problem,i.e.
one volume is lost and its good bye data.
One of the unexpected I/O oddities of Ec2 EBS volumes, is the first time you write to your
EBS disk, it takes like 2x longer, than any subsequent write. I do a disk fillup to 50%
with just dd if=/dev/zero of=/newdisk/bigfile1 bs=1024m count=1024, then wipe the big files
and afterwards writes take more normal speeds.
This is a good ec2 dev forum article on ec2 disk I/O specifics.
and this says EBS disks are bad for raid10
Amazon EC2 Disk Performance | AF-Design
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