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From: Lev Serebryakov <lev@FreeBSD.org>
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 Say, I have ZFS pool consist of raidz vdev with 3x1TB disks. It is
2Tb effective storage space, right? Now I could remove 1 disk (as
failed one) and replace it with new, 2TB HDD. After resilvering I
could replace second 1TB HDD, and, then, third one. Now I have raidz
vdev with 3x2TB disks. Will I have 4TB effective storage space in my poo
l?

 I know, that it is impossible to add NEW disk to raidz, but here is
replacement smaller disks with larger ones, one-by-one.

The same question could be asked about mirror and raidz2/raidz3 :)

- -- 
// Lev Serebryakov
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