Hallo. I'm continuing on sinking in to btrfs, so pointers to concise
help articles appreciated. I've got a couple new home systems, so
perhaps it's time to investigate encryption, and given the bit rot I've
seen here, perhaps time to mirror volumes so the wonderful btrfs
self-healing facilities can be taken advantage of.
Problem with today's hard drives, a quick look at Canada Computer shows
the smallest drives 500GB, 120GB SSDs, far more than the 20GB or so an
OS needs. Yet not looking to put in a 2nd HD, either. It feels like
mirroring volumes makes sense.
(EFI [partitions] also seem to be sticking their fingers in here.]
Assume a CD sized (680MB) /boot, and perhaps a 200MB (?) sized EFI
partition, it seems to me one sets up / as usual (less complex install),
then creates another partition for mirroring, later. IIUC, btrfs add
device /dev/sda4 / is appropriate, then. Then running a balance seems
recommended.
Confusing, however, is having those (both) partitions encrypted. Seems
some work is needed beforehand. But I've never done encryption. I have
come across https://github.com/gebi/keyctl_keyscript, so I understand
there will be gotchas to deal with - later. But not there yet, and not
real sure how to start.
The additional problem is most articles reference FDE (Full Disk
Encryption) - but that doesn't seem to be prudent. e.g. Unencrypted
/boot. So having problems finding concise links on the topics, -FDE
-"Full Disk Encryption".
Any good links to concise instructions on building / establishing
encrypted btrfs mirror volumes? dm_crypt seems to be the basis, and not
looking to add LVM, seems an unnecessary extra layer of complexity.
It also feels like I could mkfs.btrfs /dev/sda3 /dev/sda4, then mirror
subvolumes (or it inherently comes along for the ride?) - so my
confusion level increases. Especially if encryption is added to the mix.
So, I could take an HD, create partitions as above (how? e.g. Set up
encryption / btrfs mirror volumes), then clonezilla (?) partitions from
a current machine in. I assume mounting a live cd then cp -a from old
disk partition to new disk partition won't 'just work'. (?)
Article suggestions?
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