dotfiles/docs/zfs.md

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# ZFS
Swan runs its root on ext4. The ZFS drives are managed imperatively (this
[disko configuration](../disks/zfs.nix) is an unused work-in-progress).
The basic ZFS settings are managed [here](../modules/nixos/hardware/zfs.nix).
## Creating a New Dataset
```
sudo zfs create tank/mydataset
sudo zfs set compression=zstd tank/myzstddataset
sudo zfs set mountpoint=/data/mydataset tank/mydataset
```
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## Maintenance
### Get Status
```
sudo zpool status
```
### Replace Disk
```
sudo zdb
sudo zpool status -g # Show by GUID
sudo zpool offline tank <GUID>
sudo zpool status
# Remove old disk, insert new disk
sudo zdb
sudo zpool replace tank <OLD GUID> /dev/disk/by-id/<NEW PATH>
sudo zpool status
```
## Initial Setup
```
sudo zpool create tank raidz1 sda sdb sdc
sudo zpool set ashift=12 tank
sudo zpool set autoexpand=on tank
sudo zpool set compression=on tank
```