add zfs rename

infrastructure/graduated/truenas/truenas.md

@@ -33,6 +33,7 @@
   - [Mounting ZVOLS](#mounting-zvols)
   - [UPS Monitoring](#ups-monitoring)
   - [ZFS Size Data](#zfs-size-data)
+  - [ZFS Rename](#zfs-rename)
 
 ## Bios settings
 
@@ -525,3 +526,12 @@ zfs list -j enc0/vms -p -o available,used | \
 jq -r --arg TIMESTAMP `date +%s` '"driveripper.vms.data.used " + .datasets[].properties.used.value + " " + $TIMESTAMP' | \
 nc -N -4 yellow.reeselink.com 2003
 ```
+
+## ZFS Rename
+
+Make sure you unshare any connected shares, otherwise you'll get
+"cannot unmount '/mnt/enc0/smb/reese_and_alica': pool or dataset is busy"
+
+```bash
+zfs rename enc0/something enc0/something_else
+```