Jeremy Teo wrote:
I'm defining "zpool split" as the ability to divide a pool into 2
separate pools, each with identical FSes. The typical use case would
be to split a N disk mirrored pool into a N-1 pool and a 1 disk pool,
and then transport the 1 disk pool to another machine.

Can you pick another name for this please because that name has already been suggested for zfs(1) where the argument is a directory in an existing ZFS file system and the result is that the directory becomes a new ZFS file system while retaining its contents.

While contemplating "zpool split" functionality, I wondered whether we
really want such a feature because

1) SVM allows it and admins are used to it.

or

2) We can't do what we want using zfs send |zfs recv

Right now, it's looking mightly close to 1.

What problem are you actually trying to solve ? Just because you did something this way in the SVM world doesn't mean that there should be a 1:1 in the ZFS world - there might be but it doesn't follow that there should be.

--
Darren J Moffat
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