EDIT - 20230129 - Changed the btrfs replacement command a bit. Added a command block to force the SATA controller to rescan the devices available to it.
EDIT - 20211120 - Edited the page so that it makes more sense. The last couple of edits were out of sequence. Cleaned up a few things, too.
EDIT - 20211107 @ 1324 UTC-7 - Added how to monitor the drive replacement process.
EDIT - 20201206 @ 2216 UTC-7 - Added how to remove a hard drive and replace it with a bigger one to upgrade.
EDIT - 20200311 @ 1859 UTC-7 - Added how to replace a dead hard drive in a btrfs pool.