Root filesystem encrypted with btrfs and 2 ssds

[ulbr]

Hello Forum,

I am new here and also new to Mint Linux. So please forgive me if I ask a bad question.

I have setup a fresh installation of Mint Linux. Using encryption and btrfs on a single device. As the installer did not give me the option to add directly a second device I try to do this by myself like this after cryptsetup:

Code: Select all

btrfs device add /dev/mapper/sdb1_crypt /

This works very well if I not reboot.So I got the pool up and running. But on reboot I get only the chance to enter the passwort for the first device. And ending up in the busybox. So this one I got fixed by performing a new fresh install.

So the question is how to add a second encrypted device to my btrfs pool? Perhaps adding the device to the fstab?

Thanks a lot for any useful hints.

[deepakdeshp]

Please see https://btrfs.wiki.kernel.org/index.php ... le_Devices
At the same time keeping things simple avoids complications. May be use Mint for 6 months , get a hang of it , try different things , then try btrfs .Do you really need it?btrfs?

[gm10]

You need to add the second partition to /etc/crypttab for it to get unlocked automatically on boot. Use the same format as for your existing encrypted partition.

I imagine you'll also have to register it in /etc/fstab as part of your pool but I lack experience with btrfs in this context. The link in the post above should provide further guidance.

[Laurent85]

This works very well if I not reboot.So I got the pool up and running.

Before you reboot list uuid partition ids:

Code: Select all

sudo blkid

Add to /etc/crypttab second device, use uuid of /dev/sdb1 in second column:

Code: Select all

sdb1_crypt   UUID=xxx   none   luks

For an ssd drive use this line instead, notice the "discard" option at end of line:

Code: Select all

sdb1_crypt UUID=xxx none luks,discard

Update initrd file to get a prompt at startup for unlocking both drives:

Code: Select all

sudo update-initramfs -u