Update atlas README.md

hosts/atlas/README.md

@@ -13,7 +13,23 @@ A general purpose mini computer used for web browsing and multimedia.
 Device | Partitions _(filesystem, usage)_
 --- | ---
 Samsung SSD 850 | `/dev/sda1` (NTFS, Windows XP)
-Samsung SSD 850 | `/dev/sdb1` (EFI, NixOS Boot) <br> `/dev/sdb2` (ext4, NixOS Root)
+Samsung SSD 850 | `/dev/sdb1` (EFI, NixOS Boot) <br> `/dev/sdb2` (ZFS, NixOS Root)
+
+#### ZFS pool layout
+```
+tank/
+├── local
+│   ├── nix
+│   └── tmp
+├── system
+│   ├── root
+│   └── var
+└── user
+    └── home
+```
+
+See [Graham Christensen's article](https://grahamc.com/blog/nixos-on-zfs/#datasets) for the motivation behind these datasets.
 
 ### Networks
-DHCP on `10.0.1.0/24` subnet.
+- DHCP on `10.0.1.0/24` subnet.
+- Tailscale on `100.64.0.0/10` subnet. FQDN: `atlas.mesh.vimium.net`.