Hello Kyle,
you will probably have to tell btrfs to use the complete devices.
Checkout "btrfs filesystem resize". There are cases when one does not
want to grow the used space on a replacement disk automatically, e.g.
when the disk is to be replaced with a smaller disk again, so this is
not a bug.
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I have just recently replaced two 750 GB disks with two 1 TB disks. I
used the replace command to do so, aka "btrfs replace start /dev/sdX
/dev/sdY /mountpoint". Each replacement went smoothly, with no errors
reporting. I'm positive that the source
