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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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How do I do BTRFS with RAID and Encryption? (swg-empire.de)

submitted 1 month ago by bjoern_tantau@swg-empire.de to c/linux@lemmy.ml

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Hi all!

I have a Debian stable server with two hdds in a md RAID which contains an encrypted ext-4 filesystem.

sda          8:0    0   2.7T  0 disk
├─sda1       8:1    0     1G  0 part                    
│ └─md0      9:0    0  1023M  0 raid1 /boot             
├─sda2       8:2    0   2.7T  0 part                    
│ └─md2      9:2    0   2.7T  0 raid1                   
│   └─mdcrypt                                           
│          253:0    0   2.7T  0 crypt /                 
└─sda3       8:3    0     1M  0 part
sdb          8:16   0   2.7T  0 disk                    
├─sdb1       8:17   0     1G  0 part
│ └─md0      9:0    0  1023M  0 raid1 /boot             
├─sdb2       8:18   0   2.7T  0 part
│ └─md2      9:2    0   2.7T  0 raid1                   
│   └─mdcrypt
│          253:0    0   2.7T  0 crypt /                 
└─sdb3       8:19   0     1M  0 part

I'd like to migrate that over to BTRFS to make use of deduplication and snapshots.

But I have no idea how to set it up since BTRFS has its own RAID-1 configuration. Should I rather use the existing MD array? Or should I take the drives out of the array, add encryption and then add the BTRFS RAID inside that?

Or should I do something else entirely?

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[–] bjoern_tantau@swg-empire.de 3 points 1 month ago

I will be decrypting from a small busybox inside the initrd. I suspect that it will decrypt both drives if the passphrase is the same. At least that's how it works on the desktop.