On 5 Jul 2017, Wols Lists spake thusly:
My feeling was, if you can't just add drives to the existing raid 10,
create a new one which you can expand, migrate the fs across (btrfs
would let you do that live, I believe, so xfs probably can too), then
you can scrap the old raid-10 and add the drives into the new one.
In extremis you can always connect multiple block devices into one, or
indeed multiple *pieces* of them into one, using dmsetup with the linear
table. (However, this is not persistent, so you'd need to script redoing
it on every boot.)
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