I have since upgraded to mdadm 1.8 and setup a RAID10. However I need something that is production worthy. Is a RAID10 something I could rely on as well? Also under a RAID10 how do you tell it which drives you want mirrored?
raid10 is 2.6 only, but should be quite stable. You cannot tell it which drives to mirror because you shouldn't care. You just give it a bunch of identical drives and let it put the data where it wants.
If you really want to care (and I cannot imagine why you would - all drives in a raid10 are likely to get similar load) then you have to build it "by hand" - a raid0 of multiple raid1s.
But what about redundancy? The only reason why on some systems I choose raid 1+0 and not raid10, is that I want the raid 1 always on two different controllers or channels. So if there is some problem with the SCSI bus you will only loose one half of your array. I think with raid10 it can be that you loose your complete array, because a whole raid1 can sit on a single controller/channel. Is this assumption correct, or does raid10 have some magic to solve this?
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