kobol-wiki/docs/helios64/install/zfs.md

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2020-12-21 09:21:53 +01:00
# ZFS on HDD
So you already installed the system on eMMC or SD? You might want to use ZFS on the hard disk(s)!
Note: This wiki does not cover root-on-zfs. (Althrough it should be also possible.) We assume rootfs is already on eMMC (or SD) and you want to keep your data on HDDs in ZFS pool.
Important: *Focal* is required. Do not use Buster.
## **Step 1** - Install Focal on eMMC
See necessary steps [here](/helios64/install/transfer).
## **Step 2** - Install ZFS
```bash
sudo armbian-config
```
Go to Software and install headers.
```bash
sudo apt install zfs-dkms zfsutils-linux
```
Optional:
```bash
sudo apt install zfs-auto-snapshot
```
Reboot.
## **Step 3** - Prepare partitions
Use `fdisk` of `gdisk` to create necessary partitions on your hard drive. This is beyond scope of this wiki.
When ready look for assigned uuids:
```bash
ls -l /dev/disk/by-partuuid/
```
## **Step 4** - Create ZFS pool
```bash
sudo zpool create -o ashift=12 -m /mypool mypool mirror /dev/disk/by-partuuid/abc123 /dev/disk/by-partuuid/xyz789
sudo zfs set atime=off mypool
sudo zfs set compression=on mypool
```
Of course you may use more disks and create raidz instead of mirror. Your choice. :-)
Note: Do not use `/dev/sdXY` names. Use uuids only. This way your system will still work when you remove a disk or change order of disks.
If your disks are SSDs, enable trim support:
```bash
sudo zpool set autotrim=on mypool
```
## **Step 5** - Reboot
After reboot make sure the pool was imported automatically:
```bash
zpool status
```
You should now have working system with root on eMMC and ZFS pool on HDD.