From mboxrd@z Thu Jan  1 00:00:00 1970
From: Roman Mamedov <rm@romanrm.net>
Subject: Re: Linear device of two arrays
Date: Sat, 8 Jul 2017 02:53:18 +0500
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To: Andreas Klauer <Andreas.Klauer@metamorpher.de>
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On Fri, 7 Jul 2017 23:20:36 +0200
Andreas Klauer <Andreas.Klauer@metamorpher.de> wrote:

> Put LVM on top?
> 
> You could create LVM on the new array, copy your files over, then extend.
> 
> If you know LVM _really_ well, it's also possible to convert existing 
> filesystems without moving data (other than relocating the parts 
> occupied/unusable by LVM, i.e. one extent-size worth of data at 
> start and end of disk).

There is this tool which can convert filesystems/partitions to LVM in-place:

  https://github.com/g2p/blocks

however it requires a shrinkable filesystem, and XFS cannot be shrunk.

(Also it appears unmaintained with a number of long-standing unresolved
issues).

-- 
With respect,
Roman