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ZFS

Decisions
  1. While encrypting the pool volume is possible, I decided to go with a sub-volume, just in case I need to add un-encrypted data later
  2. The options for encryption keys passphrase, raw key, and hex key. I'll be using a hex key for ease of backup in my password database.
  3. When creating the pool use the entire disk, not partitions where possible
  4. When creating the pool, use /dev/disk/by-id, not /dev/sda, as these can change on boot
  1. ZFS - ArchWiki
  2. Performance tuning - OpenZFS
  3. Tips from JRS
Create the pool
zpool create datapool -o ashift=12 -o autoexpand=on mirror /dev/disk/by-id/disk1 /dev/disk/by-id/disk2
zfs set compression=lz4 datapool
zfs set atime=off datapool
Creating the Volume
  1. Generate the key
mkdir /etc/zfs/keys
chmod 700 /etc/zfs/keys
openssl rand -hex -out /etc/zfs/keys/datasetname 32
chmod 700 /etc/zfs/keys/datasetname
  1. Create datasets
## Encrypted
zfs create -o encryption=aes-256-gcm -o keyformat=hex -o keylocation=file:///etc/zfs/keys/datasetname poolname/datasetname

## Compressed
zfs create -o compression=lz4 poolname/datasetname
Backing up data
  1. Create an initial snapshot and backup
zfs snapshot poolname/datasetname@snap1
zfs send poolname/datasetname@snap1 | zfs receive backuppool/datasetname
  1. After some changes, send an incremental
zfs snapshot poolname/datasetname@snap2
zfs send -I poolname/datasetname@snap1 poolname/datasetname@snap2 | zfs receive backuppool/datasetname
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