Just a quick question if I may on the future of raid10 (of the "non-nested" variety, .i.e. set up as one device rather than a nested raid of first a RAID1 and then a RAID0). I currently set this up on my main server, and I have noticed that this setup is gaining popularity fast in the Linux community.
Currently though, my understanding is that mdadm doesn't support groving a raid10 array. I presume this is tricky, as it would require adding at least two disks to the set, but I was wondering if this is something that you have on your TODO?
I currently get around it by using LVM on top of my now two RAID10 sets, but it would be a very welcome feature, particularly in light of the growing popularity of RAID10.