Update Servers/Virtualization/Proxmox/Configuring iSCSI-based Cluster Storage.md

Servers/Virtualization/Proxmox/Configuring iSCSI-based Cluster Storage.md

@@ -93,40 +93,70 @@ ctladm devlist -v
 !!! tip
     `Size (Blocks)` must be **non-zero** and match the zvol size.  If it is `0`, stop and correct before proceeding.
 
-### Configure iSCSI Portal, Target, and Association (GUI)
-In the TrueNAS Web UI, navigate to **Sharing → Block Shares (iSCSI)** then proceed to perform the tasks seen in the tabs below, from in order from left-to-right:
+### Configure iSCSI Portal, Target, and Extent Association (CLI Only)
 
-=== "Portals"
+!!! warning "Do NOT Use the TrueNAS iSCSI GUI"
+**Once you choose a CLI-managed iSCSI configuration, the TrueNAS Web UI must never be used for iSCSI.**
+Opening or modifying **Sharing → Block Shares (iSCSI)** in the GUI will **overwrite CTL runtime state**, invalidate manual `ctladm` configuration, and result in targets that appear correct but expose **no LUNs** to initiators.
 
-    **Portals → Add**
+**This configuration is CLI-owned and CLI-managed.**
 
-    * IP Address: `0.0.0.0`
-    * Port: `3260`
+- Do **not** add, edit, or view iSCSI objects in the GUI
+- Do **not** use the iSCSI wizard
+- Do **not** mix GUI extents with CLI-created LUNs
 
-=== "Targets"
+#### Create iSCSI Portal (Listen on All Interfaces)
 
-    **Targets → Add**
+```sh
+# Backup any existing ctl.conf
+cp -av /etc/ctl.conf /etc/ctl.conf.$(date +%Y%m%d-%H%M%S).bak 2>/dev/null || true
 
-    * Target Name: `iqn.2026-01.io.bunny-lab:storage`
-    * Authentication: `None`
-    * Portal Group: `<Select the portal created above>`
+# Write a clean /etc/ctl.conf
+cat > /etc/ctl.conf <<'EOF'
+# --- Bunny Lab: Proxmox iSCSI (CLI-only) ---
 
-=== "Extents"
+# Listen on all interfaces on the default iSCSI port
+portal-group "pg0" {
+  listen 0.0.0.0:3260
+}
 
-    **Extents → Add**
+# Create a target IQN
+target "iqn.2026-01.io.bunny-lab:storage" {
+  portal-group "pg0"
 
-    * Extent Name: `ISCSI-STORAGE`
-    * Extent Type: `Device`
-    * Device: `/dev/zvol/${POOL_NAME}/${ZVOL_NAME}` (e.g. `CLUSTER-STORAGE/iscsi-storage (8T)`)
+  # Export LUN 0 backed by the zvol device
+  lun 0 {
+    path /dev/zvol/CLUSTER-STORAGE/iscsi-storage
+    serial "ISCSI-STORAGE"
+    device-id "ISCSI-STORAGE"
+  }
+}
+EOF
 
-=== "Associated Targets"
+# Restart ctld to apply the configuration file
+service ctld restart
 
-    **Associated Targets → Add**
+# Verify the iSCSI listener is actually up
+sockstat -4l | grep ':3260'
 
-    * Target: `iqn.2026-01.io.bunny-lab:storage`
-    * Extent: `ISCSI-STORAGE`
+# Verify CTL now shows an iSCSI frontend
+ctladm portlist -v | egrep -i '(^Port|iscsi|listen=)'
+```
 
-## Connect from Proxmox VE Nodes
+!!! success
+At this point, the iSCSI target is live and correctly exposing a block device to initiators.
+You may now proceed to **Connect from Proxmox VE Nodes**.
+
+---
+
+If you want, next we can:
+
+* Adjust the **earlier sections** to explicitly lock the document into “CLI-only iSCSI mode”
+* Add a **one-line guardrail** near the top of the document to prevent future foot-guns
+* Or validate the final CTL state against what Proxmox expects before PV creation
+
+
+## Connect from ProxmoxVE Nodes
 Perform the following **on each Proxmox node**.
 
 ```sh
@@ -140,6 +170,9 @@ iscsiadm -m discovery -t sendtargets -p <TRUENAS_IP>
 # Log In
 iscsiadm -m node --login
 
+# Rescan SCSI Bus
+iscsiadm -m session -P 3
+
 ### Verify Device
 lsblk
 ```