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this post was submitted on 12 Aug 2023
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it's not the recommended way but it's how I've been doing.
you format the new drives and just cp -a -x from the running os to the destination, update the destination fstab, then treat the new drives as an os with a broken boot and continue from there.
Don't cp, use rsync!
why not?
sudo cp -axfoots the bill.I assume people prefer rsync because you may need to run it twice, but unless you tick all the boxes rsync won't copy capabilities (see
getcap /usr/bin/rsh)sudo cp -ax is short and sweet and does everything right.
Why not DD? Dd is agnostic to anything, just copy over the entire partition and you're golden
Man I always forget about dd and jump to gparted.
dd is good if the destination disk is equal or bigger, unless you are brave enough to shrink the source partition.
if you are moving to a smaller disk for whatever reason (hdd to sdd) then you need to fallback to a different method, which takes us back to cp/rsync.
Because
catandcpare faster if you don't pick a good block size fordd.How are you supposed to use
catto copy files?catting binary files does, interesting things.You cat the device files of the partitions directly into each other.
cat /dev/sda/ > /dev/sdb?I'm always hesitant to use the "disk destroyer", even as a regular user.
rsyncdoes a good job and it's maybe even more agnostic thanddsince it doesn't really care about the partition size, as long as all data fits.rsyncis also more reliable: in cases the transfer is interrupted it only transfers what's missing and it can run the checksums making sure there were no transfer errors. I don't see a good reason to usecp.@CAPSLOCKFTW @anonono of I rsymc an entire drive, does it preserve all attributed and partitions, or does it just sync a particular file system.
You can only rsync a file system, you have to do the partioning beforehand. It does preserve all attributes though, if you use the right flags.