Hi,
I just tried an idea I got after fiddling with raid10 and to my dismay
it worked as I thought it will. I used two small partitions on separate
disks to create a raid1 array. Then I did dd if=/dev/md2 of=/dev/null. I
got only one of the disks reading. Nothing unexpected. Then I created a
raid10 array on the same two partitions with the options -l10 -n2 -pf2.
The same dd executed at twice the speed, reading _simultaneously_ from
both drives. I did some bonnie++ benchmarking - same result - raid1
reads only from a single disk raid10 from both. Write performance is
worse (about 10% slower) with raid10, but you get twice the read speed.
In this light the obvious question is: can raid10 be used as a drop-in
replacement for raid1 or there is a caveat with having the amount of
disks equal the amount of chunk copies?
Peter
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