# cryptsetup -v -c aes-xts-plain64 -h sha512 -s 512 luksFormat /dev/sdc /etc/cryptkey
# cryptsetup -v -c aes-xts-plain64 -h sha512 -s 512 luksFormat /dev/sde /etc/cryptkey

cryptsetup -v -c aes-xts-plain64 -h sha512 -s 512 luksFormat /dev/sdc -
cryptsetup -v -c aes-xts-plain64 -h sha512 -s 512 luksFormat /dev/sde -

cryptsetup luksHeaderBackup --header-backup-file ~/sde.header.bak /dev/sde
cryptsetup luksHeaderBackup --header-backup-file ~/sdc.header.bak /dev/sdc

/etc/crypttab
doc1 UUID=dcfc1a1e-7920-43e4-a55a-e841fb23a389 /etc/cryptkey luks,noearly #,discard (for SSDs)
doc2 UUID=8445e3f9-4c73-4726-966b-1b8ec8fa9675 /etc/cryptkey luks,noearly #,discard (for SSDs)

/dev/sde: UUID="cf6bafca-b225-46ca-8dfc-b82fb6ab5560" TYPE="crypto_LUKS"
/dev/sdc: UUID="05f833fb-1c68-4453-9df5-68a454f59845" TYPE="crypto_LUKS"

# cryptsetup open --key-file=/etc/cryptkey --type luks /dev/sde doc1
# cryptsetup open --key-file=/etc/cryptkey --type luks /dev/sdc doc2

cryptsetup open --type luks /dev/sde doc1
cryptsetup open --type luks /dev/sdc doc2


mkfs.btrfs -f -L docs -m raid1 -d raid1 /dev/mapper/doc1 /dev/mapper/doc2

Label:              docs
UUID:               2ae0eae2-bc13-4dbc-baa7-6e902847e0a6
Node size:          16384
Sector size:        4096
Filesystem size:    1.82TiB
Block group profiles:
  Data:             RAID1             1.00GiB
  Metadata:         RAID1             1.00GiB
  System:           RAID1             8.00MiB
SSD detected:       no
Zoned device:       no
Incompat features:  extref, skinny-metadata, no-holes, free-space-tree
Runtime features:   free-space-tree
Checksum:           crc32c
Number of devices:  2
Devices:
   ID        SIZE  PATH
    1   931.51GiB  /dev/mapper/doc1
    2   931.51GiB  /dev/mapper/doc2



mount -t btrfs -o defaults,noatime,compress=zstd -L docs /docs


sudo blkid /dev/mapper/doc1
/dev/mapper/doc1: LABEL="docs" UUID="cd4efb2f-a791-41de-8f19-65baf747c57c" UUID_SUB="c0356a61-57e8-4f1e-b9cb-7ca16c5e8c0b" BLOCK_SIZE="4096" TYPE="btrfs"


/dev/mapper/doc1: LABEL="docs" UUID="cd4efb2f-a791-41de-8f19-65baf747c57c" UUID_SUB="c0356a61-57e8-4f1e-b9cb-7ca16c5e8c0b" BLOCK_SIZE="4096" TYPE="btrfs"

/dev/mapper/doc2: LABEL="docs" UUID="cd4efb2f-a791-41de-8f19-65baf747c57c" UUID_SUB="d3266122-df77-49e6-be86-4bb6226e96df" BLOCK_SIZE="4096" TYPE="btrfs"