Add notes for ZFS setup

README.md

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+# My personal homelab setup
+
+Currently running on a Debian host
+
+## Raw data
+
+Raw data is stored in `/data`, a ZFS data set
+
+```bash
+# Install ZFS
+apt update
+apt install linux-headers-amd64
+apt install zfsutils-linux zfs-dkms
+
+zpool create hdd raidz2 <disks...>
+mkdir -p /data
+zfs create -o mountpoint=/data hdd/data
+zfs set compression=on hdd/data
+```
+