David Brown wrote:
No, md RAID10 does /not/ offer more redundancy than RAID1. You are right that md RAID10 offers more than RAID1 (or traditional RAID0 over RAID1 sets) - but it is a convenience and performance benefit, not a redundancy benefit. In particular, it lets you build RAID10 from any number of disks, not just two. And it lets you stripe over all disks, improving performance for some loads (though not /all/ loads - if you have lots of concurrent small reads, you may be faster using plain RAID1).
wasn't suggesting that it does - just that it does things differently than normal raid 1+0 - for example, by doing mirroring and striping as a unitary operation, it works across odd number of drives - it also (I think) allows for more than 2 copies of a block (not completely clear how many copies of a block would be made if you specified a 16 drive array) - sort of what I'm wondering here
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