On Tue, Dec 31, 2019 at 17:05:41 -0700,
"John M. Harris Jr." <johnmh@xxxxxxxxxxxxx> wrote:
If that's the case for LVM, then it seems that mdadm would be the easier and
safer option. You simply create an array with a missing disk, copy the data
over, then add the existing disk to the array.
If you copy block by block, you still need to make sure you have room for
the metadata and the filesystem. If you are thinking about using cp, then
you need to worry about sparse and special files and maybe hard links.
Note you can also use partitions for arrays rather than a whole disk.
Also note that raid doesn't replace backups. There are others ways to
wreck your data than having a disk drive fail.
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